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Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Actual Return on Plan Assets      
Transfers into Level 3 $ 13 [1],[2] $ 18 [1],[2]  
Transfers out of Level 3 (12) [2],[3] (53) [2],[3]  
Benefit Plans (Textuals) [Abstract]      
Cost of Company Matching Contributions 64 61 74
Matching Contributions Provided, Percentage 100.00%    
Second Matching Contributions Provided, Percentage 70.00%    
Eligible Compensation Contribution by Employee 1.00%    
Second Eligible Compensation Contribution by Employee 5.00%    
Nonqualified Pension Plans [Member]
     
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 89 80  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 89 80  
Qualified Pension Plans [Member]
     
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 4,808 4,659  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 4,808 4,659  
Pension Plans [Member]
     
Actuarial Assumptions for Benefit Obligations      
Discount Rate 4.55% 5.05%  
Rate of Compensation Increase 4.85% [4] 4.95% [4]  
Actuarial Assumptions for Net Periodic Benefit Costs      
Discount Rate 5.05% 5.60% 6.00%
Expected Return on Plan Assets 7.75% 8.00% 8.00%
Rate of Compensation Increase 4.85% 4.60% 5.90%
Change in Benefit Obligation      
Benefit Obligation at January 1 4,807 4,701  
Service Cost 72 111 104
Interest Cost 237 253 254
Actuarial Loss 169 222  
Plan Amendment Prior Service Credit 0 0  
Curtailment 0 0  
Benefit Payments (294) (480)  
Participant Contributions 0 0  
Medicare Subsidy 0 0  
Benefit Obligation at December 31 4,991 4,807 4,701
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at January 1 3,858 3,403  
Actual Gain (Loss) on Plan Assets 282 420  
Company Contributions 457 515  
Participant Contributions 0 0  
Benefit Payments (294) (480)  
Fair Value of Plan Assets at December 31 4,303 3,858 3,403
Underfunded Status at December 31 (688) (949)  
Benefit Amounts Recognized on the Balance Sheets      
Other Current Liabilities - Accrued Short-term Benefit Liability (8) (8)  
Employee Benefits and Pension Obligations - Accrued Long-term Benefit Liability (680) (941)  
Underfunded Status (688) (949)  
Components      
Net Actuarial Loss 2,208 2,129  
Prior Service Cost (Credit) 10 11  
Transition Obligation 0 0  
Components of Change in Amounts Included in AOCI and Regulatory Assets      
Actuarial Loss During the Year 201 121  
Prior Service Credit 0 0  
Amortization of Actuarial Loss (122) (89)  
Amortization of Prior Service Credit (Cost) (1) 0  
Amortization of Transition Obligation 0 0  
Change for the Year 78 32  
Pension and Other Postretirement Plans' Assets      
Asset Class 4,303 3,858 3,403
Year End Allocation      
Total 100.00% 100.00%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 4,303 3,858 3,403
Actual Return on Plan Assets      
Fair Value of Plan Assets 4,303 3,858 3,403
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 4,897 4,739  
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 4,991 4,807 4,701
Accumulated Benefit Obligation 4,897 4,739  
Fair Value of Plan Assets 4,303 3,858 3,403
Underfunded Accumulated Benefit Obligation (594) (881)  
Components of Net Periodic Benefit Cost      
Service Cost 72 111 104
Interest Cost 237 253 254
Expected Return on Plan Assets (314) (312) (321)
Curtailment 0 0 0
Amortization of Transition Obligation 0 0 0
Amortization of Prior Service Cost (Credit) 1 0 0
Amortization of Net Actuarial Loss 122 89 59
Net Periodic Benefit Cost 118 141 96
Capitalized Portion (37) (44) (30)
Net Periodic Benefit Cost Recognized as Expense 81 97 66
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012      
Net Actuarial Loss 145    
Prior Service Cost (Credit) (1)    
Transition Obligation 0    
Total Estimated 2012 Amortization 144    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012 144    
Benefit Plans (Textuals) [Abstract]      
Rate of Compensation Increase 4.85% [4] 4.95% [4]  
Expected Contributions and Payments During 2012 208    
Pension Plans [Member] | Maximum [Member]
     
Actuarial Assumptions for Benefit Obligations      
Rate of Compensation Increase 11.50%    
Benefit Plans (Textuals) [Abstract]      
Rate of Compensation Increase 11.50%    
Pension Plans [Member] | Minimum [Member]
     
Actuarial Assumptions for Benefit Obligations      
Rate of Compensation Increase 3.50%    
Benefit Plans (Textuals) [Abstract]      
Rate of Compensation Increase 3.50%    
Pension Plans [Member] | Pension Payments [Member]
     
Estimated Future Benefit Payments and Contributions      
2012 327    
2013 334    
2014 354    
2015 356    
2016 360    
Years 2017 to 2021, in Total 1,864    
Other Postretirement Benefit Plans [Member]
     
Actuarial Assumptions for Benefit Obligations      
Discount Rate 4.75% 5.25%  
Actuarial Assumptions for Net Periodic Benefit Costs      
Discount Rate 5.25% 5.85% 6.10%
Expected Return on Plan Assets 7.50% 8.00% 7.75%
Health Care Trend Rates      
Initial 7.50% 8.00%  
Ultimate 5.00% 5.00%  
Year Ultimate Reached 2016 2016  
Effect of a 1% Change in Assumed Health Care Cost Trend Rates for the OPEB Health Care Plans      
Effect of 1% Increase on Total Service and Interest Cost Components of Net Periodic Postretirement Health Care Benefit Cost 23    
Effect of 1% Increase on the Health Care Component of the Accumulated Postretirement Benefit Obligation 274    
Effect of 1% Decrease on Total Service and Interest Cost Components of Net Periodic Postretirement Health Care Benefit Cost (18)    
Effect of 1% Decrease on the Health Care Component of the Accumulated Postretirement Benefit Obligation (223)    
Change in Benefit Obligation      
Benefit Obligation at January 1 2,125 1,941  
Service Cost 42 47 42
Interest Cost 109 113 110
Actuarial Loss 253 164  
Plan Amendment Prior Service Credit (196) (36)  
Curtailment 1 0  
Benefit Payments (150) (142)  
Participant Contributions 34 29  
Medicare Subsidy 9 9  
Benefit Obligation at December 31 2,227 2,125 1,941
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at January 1 1,461 1,308  
Actual Gain (Loss) on Plan Assets (14) 149  
Company Contributions 79 117  
Participant Contributions 34 29  
Benefit Payments (150) (142)  
Fair Value of Plan Assets at December 31 1,410 1,461 1,308
Underfunded Status at December 31 (817) (664)  
Benefit Amounts Recognized on the Balance Sheets      
Other Current Liabilities - Accrued Short-term Benefit Liability (4) (4)  
Employee Benefits and Pension Obligations - Accrued Long-term Benefit Liability (813) (660)  
Underfunded Status (817) (664)  
Components      
Net Actuarial Loss 979 638  
Prior Service Cost (Credit) (210) (20)  
Transition Obligation 1 3  
Components of Change in Amounts Included in AOCI and Regulatory Assets      
Actuarial Loss During the Year 370 121  
Prior Service Credit (191) (36)  
Amortization of Actuarial Loss (29) (29)  
Amortization of Prior Service Credit (Cost) 1 0  
Amortization of Transition Obligation (2) (27)  
Change for the Year 149 29  
Pension and Other Postretirement Plans' Assets      
Asset Class 1,410 1,461 1,308
Year End Allocation      
Total 100.00% 100.00%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 1,410 1,461 1,308
Actual Return on Plan Assets      
Fair Value of Plan Assets 1,410 1,461 1,308
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 2,227 2,125 1,941
Fair Value of Plan Assets 1,410 1,461 1,308
Components of Net Periodic Benefit Cost      
Service Cost 42 47 42
Interest Cost 109 113 110
Expected Return on Plan Assets (109) (105) (80)
Curtailment 1 0 0
Amortization of Transition Obligation 2 27 27
Amortization of Prior Service Cost (Credit) (1) 0 0
Amortization of Net Actuarial Loss 29 29 42
Net Periodic Benefit Cost 73 111 141
Capitalized Portion (22) (35) (44)
Net Periodic Benefit Cost Recognized as Expense 51 76 97
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012      
Net Actuarial Loss 59    
Prior Service Cost (Credit) (18)    
Transition Obligation 1    
Total Estimated 2012 Amortization 42    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012 42    
Benefit Plans (Textuals) [Abstract]      
Expected Contributions and Payments During 2012 99    
Other Postretirement Benefit Plans [Member] | Medicare Subsidy Receipts [Member]
     
Estimated Future Benefit Payments and Contributions      
2012 9    
2013 0    
2014 0    
2015 0    
2016 0    
Years 2017 to 2021, in Total 2    
Other Postretirement Benefit Plans [Member] | Benefit Payments [Member]
     
Estimated Future Benefit Payments and Contributions      
2012 145    
2013 148    
2014 153    
2015 160    
2016 168    
Years 2017 to 2021, in Total 955    
Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 1,958 1,865  
Pension and Other Postretirement Plans' Assets      
Asset Class 1,958 1,865  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 1,958 1,865  
Actual Return on Plan Assets      
Fair Value of Plan Assets 1,958 1,865  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 1,958 1,865  
Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 745 825  
Pension and Other Postretirement Plans' Assets      
Asset Class 745 825  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 745 825  
Actual Return on Plan Assets      
Fair Value of Plan Assets 745 825  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 745 825  
Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 2,277 2,053  
Pension and Other Postretirement Plans' Assets      
Asset Class 2,277 2,053  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 2,277 2,053  
Actual Return on Plan Assets      
Fair Value of Plan Assets 2,277 2,053  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 2,277 2,053  
Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 671 632  
Pension and Other Postretirement Plans' Assets      
Asset Class 671 632  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 671 632  
Actual Return on Plan Assets      
Fair Value of Plan Assets 671 632  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 671 632  
Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at January 1 213 196  
Fair Value of Plan Assets at December 31 330 213  
Pension and Other Postretirement Plans' Assets      
Asset Class 330 213  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 330 213  
Actual Return on Plan Assets      
Relating to Assets Still Held as of the Reporting Date 31 (3)  
Relating to Assets Sold During the Period 3 1  
Purchases and Sales 77 19  
Transfers into Level 3 6 0  
Transfers out of Level 3 0 0  
Fair Value of Plan Assets 330 213  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 330 213  
Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 (262) (273)  
Pension and Other Postretirement Plans' Assets      
Asset Class (262) (273)  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 (262) (273)  
Actual Return on Plan Assets      
Fair Value of Plan Assets (262) (273)  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets (262) (273)  
Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 (6) 4  
Pension and Other Postretirement Plans' Assets      
Asset Class (6) 4  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 (6) 4  
Actual Return on Plan Assets      
Fair Value of Plan Assets (6) 4  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets (6) 4  
Equities [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 2,086 2,030  
Pension and Other Postretirement Plans' Assets      
Asset Class 2,086 2,030  
Year End Allocation      
Total 48.50% 52.60%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 2,086 2,030  
Actual Return on Plan Assets      
Fair Value of Plan Assets 2,086 2,030  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 2,086 2,030  
Equities [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 827 919  
Pension and Other Postretirement Plans' Assets      
Asset Class 827 919  
Year End Allocation      
Total 58.70% 63.00%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 827 919  
Actual Return on Plan Assets      
Fair Value of Plan Assets 827 919  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 827 919  
Equities [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 1,958 1,865  
Pension and Other Postretirement Plans' Assets      
Asset Class 1,958 1,865  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 1,958 1,865  
Actual Return on Plan Assets      
Fair Value of Plan Assets 1,958 1,865  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 1,958 1,865  
Equities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 728 804  
Pension and Other Postretirement Plans' Assets      
Asset Class 728 804  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 728 804  
Actual Return on Plan Assets      
Fair Value of Plan Assets 728 804  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 728 804  
Equities [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 128 165  
Pension and Other Postretirement Plans' Assets      
Asset Class 128 165  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 128 165  
Actual Return on Plan Assets      
Fair Value of Plan Assets 128 165  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 128 165  
Equities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 99 115  
Pension and Other Postretirement Plans' Assets      
Asset Class 99 115  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 99 115  
Actual Return on Plan Assets      
Fair Value of Plan Assets 99 115  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 99 115  
Equities [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Equities [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Equities [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Equities [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Domestic [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 1,455 1,352  
Pension and Other Postretirement Plans' Assets      
Asset Class 1,455 1,352  
Year End Allocation      
Total 33.80% 35.10%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 1,455 1,352  
Actual Return on Plan Assets      
Fair Value of Plan Assets 1,455 1,352  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 1,455 1,352  
Domestic [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 348 584  
Pension and Other Postretirement Plans' Assets      
Asset Class 348 584  
Year End Allocation      
Total 24.70% 40.00%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 348 584  
Actual Return on Plan Assets      
Fair Value of Plan Assets 348 584  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 348 584  
Domestic [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 1,455 1,350  
Pension and Other Postretirement Plans' Assets      
Asset Class 1,455 1,350  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 1,455 1,350  
Actual Return on Plan Assets      
Fair Value of Plan Assets 1,455 1,350  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 1,455 1,350  
Domestic [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 348 584  
Pension and Other Postretirement Plans' Assets      
Asset Class 348 584  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 348 584  
Actual Return on Plan Assets      
Fair Value of Plan Assets 348 584  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 348 584  
Domestic [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 2  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 2  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 2  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 2  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 2  
Domestic [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Domestic [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Domestic [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Domestic [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Domestic [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
International [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 399 403  
Pension and Other Postretirement Plans' Assets      
Asset Class 399 403  
Year End Allocation      
Total 9.30% 10.40%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 399 403  
Actual Return on Plan Assets      
Fair Value of Plan Assets 399 403  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 399 403  
International [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 380 220  
Pension and Other Postretirement Plans' Assets      
Asset Class 380 220  
Year End Allocation      
Total 27.00% 15.10%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 380 220  
Actual Return on Plan Assets      
Fair Value of Plan Assets 380 220  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 380 220  
International [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 399 403  
Pension and Other Postretirement Plans' Assets      
Asset Class 399 403  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 399 403  
Actual Return on Plan Assets      
Fair Value of Plan Assets 399 403  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 399 403  
International [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 380 220  
Pension and Other Postretirement Plans' Assets      
Asset Class 380 220  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 380 220  
Actual Return on Plan Assets      
Fair Value of Plan Assets 380 220  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 380 220  
International [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
International [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
International [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
International [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
International [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
International [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Real Estate Investment Trusts [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 104 112  
Pension and Other Postretirement Plans' Assets      
Asset Class 104 112  
Year End Allocation      
Total 2.40% 2.90%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 104 112  
Actual Return on Plan Assets      
Fair Value of Plan Assets 104 112  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 104 112  
Real Estate Investment Trusts [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 104 112  
Pension and Other Postretirement Plans' Assets      
Asset Class 104 112  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 104 112  
Actual Return on Plan Assets      
Fair Value of Plan Assets 104 112  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 104 112  
Real Estate Investment Trusts [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Real Estate Investment Trusts [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Real Estate Investment Trusts [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Common Collective Trust International [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 128 163  
Pension and Other Postretirement Plans' Assets      
Asset Class 128 163  
Year End Allocation      
Total 3.00% 4.20%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 128 163  
Actual Return on Plan Assets      
Fair Value of Plan Assets 128 163  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 128 163  
Common Collective Trust International [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Common Collective Trust International [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 128 163  
Pension and Other Postretirement Plans' Assets      
Asset Class 128 163  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 128 163  
Actual Return on Plan Assets      
Fair Value of Plan Assets 128 163  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 128 163  
Common Collective Trust International [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Common Collective Trust International [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Common Collective Trust Global [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 99 115  
Pension and Other Postretirement Plans' Assets      
Asset Class 99 115  
Year End Allocation      
Total 7.00% 7.90%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 99 115  
Actual Return on Plan Assets      
Fair Value of Plan Assets 99 115  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 99 115  
Common Collective Trust Global [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Common Collective Trust Global [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 99 115  
Pension and Other Postretirement Plans' Assets      
Asset Class 99 115  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 99 115  
Actual Return on Plan Assets      
Fair Value of Plan Assets 99 115  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 99 115  
Common Collective Trust Global [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Common Collective Trust Global [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Fixed Income [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 1,847 1,507  
Pension and Other Postretirement Plans' Assets      
Asset Class 1,847 1,507  
Year End Allocation      
Total 42.90% 39.00%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 1,847 1,507  
Actual Return on Plan Assets      
Fair Value of Plan Assets 1,847 1,507  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 1,847 1,507  
Fixed Income [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 345 280  
Pension and Other Postretirement Plans' Assets      
Asset Class 345 280  
Year End Allocation      
Total 24.40% 19.20%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 345 280  
Actual Return on Plan Assets      
Fair Value of Plan Assets 345 280  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 345 280  
Fixed Income [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Fixed Income [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Fixed Income [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 1,841 1,507  
Pension and Other Postretirement Plans' Assets      
Asset Class 1,841 1,507  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 1,841 1,507  
Actual Return on Plan Assets      
Fair Value of Plan Assets 1,841 1,507  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 1,841 1,507  
Fixed Income [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 345 280  
Pension and Other Postretirement Plans' Assets      
Asset Class 345 280  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 345 280  
Actual Return on Plan Assets      
Fair Value of Plan Assets 345 280  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 345 280  
Fixed Income [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 6 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 6 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 6 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 6 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 6 0  
Fixed Income [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Fixed Income [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Fixed Income [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Common Collective Trust - Debt [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 26    
Pension and Other Postretirement Plans' Assets      
Asset Class 26    
Year End Allocation      
Total 0.60%    
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 26    
Actual Return on Plan Assets      
Fair Value of Plan Assets 26    
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 26    
Common Collective Trust - Debt [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 69 48  
Pension and Other Postretirement Plans' Assets      
Asset Class 69 48  
Year End Allocation      
Total 4.90% 3.30%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 69 48  
Actual Return on Plan Assets      
Fair Value of Plan Assets 69 48  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 69 48  
Common Collective Trust - Debt [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0    
Pension and Other Postretirement Plans' Assets      
Asset Class 0    
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0    
Actual Return on Plan Assets      
Fair Value of Plan Assets 0    
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0    
Common Collective Trust - Debt [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Common Collective Trust - Debt [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 26    
Pension and Other Postretirement Plans' Assets      
Asset Class 26    
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 26    
Actual Return on Plan Assets      
Fair Value of Plan Assets 26    
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 26    
Common Collective Trust - Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 69 48  
Pension and Other Postretirement Plans' Assets      
Asset Class 69 48  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 69 48  
Actual Return on Plan Assets      
Fair Value of Plan Assets 69 48  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 69 48  
Common Collective Trust - Debt [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0    
Pension and Other Postretirement Plans' Assets      
Asset Class 0    
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0    
Actual Return on Plan Assets      
Fair Value of Plan Assets 0    
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0    
Common Collective Trust - Debt [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Common Collective Trust - Debt [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0    
Pension and Other Postretirement Plans' Assets      
Asset Class 0    
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0    
Actual Return on Plan Assets      
Fair Value of Plan Assets 0    
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0    
Common Collective Trust - Debt [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
United States Government and Agency Securities [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 566 634  
Pension and Other Postretirement Plans' Assets      
Asset Class 566 634  
Year End Allocation      
Total 13.20% 16.40%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 566 634  
Actual Return on Plan Assets      
Fair Value of Plan Assets 566 634  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 566 634  
United States Government and Agency Securities [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 81 93  
Pension and Other Postretirement Plans' Assets      
Asset Class 81 93  
Year End Allocation      
Total 5.70% 6.40%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 81 93  
Actual Return on Plan Assets      
Fair Value of Plan Assets 81 93  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 81 93  
United States Government and Agency Securities [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
United States Government and Agency Securities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
United States Government and Agency Securities [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 566 634  
Pension and Other Postretirement Plans' Assets      
Asset Class 566 634  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 566 634  
Actual Return on Plan Assets      
Fair Value of Plan Assets 566 634  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 566 634  
United States Government and Agency Securities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 81 93  
Pension and Other Postretirement Plans' Assets      
Asset Class 81 93  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 81 93  
Actual Return on Plan Assets      
Fair Value of Plan Assets 81 93  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 81 93  
United States Government and Agency Securities [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
United States Government and Agency Securities [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
United States Government and Agency Securities [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
United States Government and Agency Securities [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Corporate Debt [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 991 672  
Pension and Other Postretirement Plans' Assets      
Asset Class 991 672  
Year End Allocation      
Total 23.00% 17.40%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 991 672  
Actual Return on Plan Assets      
Fair Value of Plan Assets 991 672  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 991 672  
Corporate Debt [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 152 110  
Pension and Other Postretirement Plans' Assets      
Asset Class 152 110  
Year End Allocation      
Total 10.80% 7.50%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 152 110  
Actual Return on Plan Assets      
Fair Value of Plan Assets 152 110  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 152 110  
Corporate Debt [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Corporate Debt [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Corporate Debt [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 985 672  
Pension and Other Postretirement Plans' Assets      
Asset Class 985 672  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 985 672  
Actual Return on Plan Assets      
Fair Value of Plan Assets 985 672  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 985 672  
Corporate Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 152 110  
Pension and Other Postretirement Plans' Assets      
Asset Class 152 110  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 152 110  
Actual Return on Plan Assets      
Fair Value of Plan Assets 152 110  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 152 110  
Corporate Debt [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at January 1 0    
Fair Value of Plan Assets at December 31 6    
Pension and Other Postretirement Plans' Assets      
Asset Class 6    
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 6    
Actual Return on Plan Assets      
Relating to Assets Still Held as of the Reporting Date 0    
Relating to Assets Sold During the Period 0    
Purchases and Sales 0    
Transfers into Level 3 6    
Transfers out of Level 3 0    
Fair Value of Plan Assets 6    
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 6    
Corporate Debt [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Corporate Debt [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Corporate Debt [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Foreign Debt [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 190 127  
Pension and Other Postretirement Plans' Assets      
Asset Class 190 127  
Year End Allocation      
Total 4.40% 3.30%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 190 127  
Actual Return on Plan Assets      
Fair Value of Plan Assets 190 127  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 190 127  
Foreign Debt [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 32 25  
Pension and Other Postretirement Plans' Assets      
Asset Class 32 25  
Year End Allocation      
Total 2.30% 1.70%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 32 25  
Actual Return on Plan Assets      
Fair Value of Plan Assets 32 25  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 32 25  
Foreign Debt [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Foreign Debt [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Foreign Debt [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 190 127  
Pension and Other Postretirement Plans' Assets      
Asset Class 190 127  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 190 127  
Actual Return on Plan Assets      
Fair Value of Plan Assets 190 127  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 190 127  
Foreign Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 32 25  
Pension and Other Postretirement Plans' Assets      
Asset Class 32 25  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 32 25  
Actual Return on Plan Assets      
Fair Value of Plan Assets 32 25  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 32 25  
Foreign Debt [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Foreign Debt [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Foreign Debt [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Foreign Debt [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
State and Local Government [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 48 23  
Pension and Other Postretirement Plans' Assets      
Asset Class 48 23  
Year End Allocation      
Total 1.10% 0.60%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 48 23  
Actual Return on Plan Assets      
Fair Value of Plan Assets 48 23  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 48 23  
State and Local Government [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 9 3  
Pension and Other Postretirement Plans' Assets      
Asset Class 9 3  
Year End Allocation      
Total 0.60% 0.20%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 9 3  
Actual Return on Plan Assets      
Fair Value of Plan Assets 9 3  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 9 3  
State and Local Government [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
State and Local Government [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
State and Local Government [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 48 23  
Pension and Other Postretirement Plans' Assets      
Asset Class 48 23  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 48 23  
Actual Return on Plan Assets      
Fair Value of Plan Assets 48 23  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 48 23  
State and Local Government [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 9 3  
Pension and Other Postretirement Plans' Assets      
Asset Class 9 3  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 9 3  
Actual Return on Plan Assets      
Fair Value of Plan Assets 9 3  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 9 3  
State and Local Government [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
State and Local Government [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
State and Local Government [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
State and Local Government [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Other - Asset Backed | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 26 51  
Pension and Other Postretirement Plans' Assets      
Asset Class 26 51  
Year End Allocation      
Total 0.60% 1.30%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 26 51  
Actual Return on Plan Assets      
Fair Value of Plan Assets 26 51  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 26 51  
Other - Asset Backed | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 2 1  
Pension and Other Postretirement Plans' Assets      
Asset Class 2 1  
Year End Allocation      
Total 0.10% 0.10%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 2 1  
Actual Return on Plan Assets      
Fair Value of Plan Assets 2 1  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 2 1  
Other - Asset Backed | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Other - Asset Backed | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Other - Asset Backed | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 26 51  
Pension and Other Postretirement Plans' Assets      
Asset Class 26 51  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 26 51  
Actual Return on Plan Assets      
Fair Value of Plan Assets 26 51  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 26 51  
Other - Asset Backed | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 2 1  
Pension and Other Postretirement Plans' Assets      
Asset Class 2 1  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 2 1  
Actual Return on Plan Assets      
Fair Value of Plan Assets 2 1  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 2 1  
Other - Asset Backed | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Other - Asset Backed | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Other - Asset Backed | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Other - Asset Backed | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Real Estate [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 163 83  
Pension and Other Postretirement Plans' Assets      
Asset Class 163 83  
Year End Allocation      
Total 3.80% 2.20%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 163 83  
Actual Return on Plan Assets      
Fair Value of Plan Assets 163 83  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 163 83  
Real Estate [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Real Estate [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Real Estate [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at January 1 83 90  
Fair Value of Plan Assets at December 31 163 83  
Pension and Other Postretirement Plans' Assets      
Asset Class 163 83  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 163 83  
Actual Return on Plan Assets      
Relating to Assets Still Held as of the Reporting Date 22 (7)  
Relating to Assets Sold During the Period 0 0  
Purchases and Sales 58 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value of Plan Assets 163 83  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 163 83  
Real Estate [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Alternative Investments [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 161 130  
Pension and Other Postretirement Plans' Assets      
Asset Class 161 130  
Year End Allocation      
Total 3.70% 3.40%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 161 130  
Actual Return on Plan Assets      
Fair Value of Plan Assets 161 130  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 161 130  
Alternative Investments [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Alternative Investments [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Alternative Investments [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at January 1 130 106  
Fair Value of Plan Assets at December 31 161 130  
Pension and Other Postretirement Plans' Assets      
Asset Class 161 130  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 161 130  
Actual Return on Plan Assets      
Relating to Assets Still Held as of the Reporting Date 9 4  
Relating to Assets Sold During the Period 3 1  
Purchases and Sales 19 19  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value of Plan Assets 161 130  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 161 130  
Alternative Investments [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Securities Lending [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 215 254  
Pension and Other Postretirement Plans' Assets      
Asset Class 215 254  
Year End Allocation      
Total 5.00% 6.60%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 215 254  
Actual Return on Plan Assets      
Fair Value of Plan Assets 215 254  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 215 254  
Securities Lending [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Securities Lending [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 215 254  
Pension and Other Postretirement Plans' Assets      
Asset Class 215 254  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 215 254  
Actual Return on Plan Assets      
Fair Value of Plan Assets 215 254  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 215 254  
Securities Lending [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Securities Lending [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Securities Pledged as Collateral [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 (236) [5] (276) [5]  
Pension and Other Postretirement Plans' Assets      
Asset Class (236) [5] (276) [5]  
Year End Allocation      
Total (5.50%) [5] (7.10%) [5]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 (236) [5] (276) [5]  
Actual Return on Plan Assets      
Fair Value of Plan Assets (236) [5] (276) [5]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets (236) [5] (276) [5]  
Securities Pledged as Collateral [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 [5] 0 [5]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 [5] 0 [5]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 [5] 0 [5]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 [5] 0 [5]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 [5] 0 [5]  
Securities Pledged as Collateral [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 [5] 0 [5]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 [5] 0 [5]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 [5] 0 [5]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 [5] 0 [5]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 [5] 0 [5]  
Securities Pledged as Collateral [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 [5] 0 [5]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 [5] 0 [5]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 [5] 0 [5]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 [5] 0 [5]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 [5] 0 [5]  
Securities Pledged as Collateral [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 (236) [5] (276) [5]  
Pension and Other Postretirement Plans' Assets      
Asset Class (236) [5] (276) [5]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 (236) [5] (276) [5]  
Actual Return on Plan Assets      
Fair Value of Plan Assets (236) [5] (276) [5]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets (236) [5] (276) [5]  
Cash and Cash Equivalents [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 93 129 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 93 129 [6]  
Year End Allocation      
Total 2.20% 3.30% [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 93 129 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 93 129 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 93 129 [6]  
Cash and Cash Equivalents [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 40 47 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 40 47 [6]  
Year End Allocation      
Total 2.90% 3.20% [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 40 47 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 40 47 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 40 47 [6]  
Cash and Cash Equivalents [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0 [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0 [6]  
Cash and Cash Equivalents [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 17 21 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 17 21 [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 17 21 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 17 21 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 17 21 [6]  
Cash and Cash Equivalents [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 93 127 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 93 127 [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 93 127 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 93 127 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 93 127 [6]  
Cash and Cash Equivalents [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 23 25 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 23 25 [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 23 25 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 23 25 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 23 25 [6]  
Cash and Cash Equivalents [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0 [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0 [6]  
Cash and Cash Equivalents [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0 [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0 [6]  
Cash and Cash Equivalents [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 2 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 2 [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 2 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 2 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 2 [6]  
Cash and Cash Equivalents [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 1 [6]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 1 [6]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 1 [6]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 1 [6]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 1 [6]  
Other Pending Transactions and Accrued Income [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 (26) [7] 1 [7]  
Pension and Other Postretirement Plans' Assets      
Asset Class (26) [7] 1 [7]  
Year End Allocation      
Total (0.60%) [7] 0.00% [7]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 (26) [7] 1 [7]  
Actual Return on Plan Assets      
Fair Value of Plan Assets (26) [7] 1 [7]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets (26) [7] 1 [7]  
Other Pending Transactions and Accrued Income [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 (6) [8] 3 [8]  
Pension and Other Postretirement Plans' Assets      
Asset Class (6) [8] 3 [8]  
Year End Allocation      
Total (0.50%) [8] 0.20% [8]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 (6) [8] 3 [8]  
Actual Return on Plan Assets      
Fair Value of Plan Assets (6) [8] 3 [8]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets (6) [8] 3 [8]  
Other Pending Transactions and Accrued Income [Member] | Level 1 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 [7] 0 [7]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 [7] 0 [7]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 [7] 0 [7]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 [7] 0 [7]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 [7] 0 [7]  
Other Pending Transactions and Accrued Income [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 [8] 0 [8]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 [8] 0 [8]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 [8] 0 [8]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 [8] 0 [8]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 [8] 0 [8]  
Other Pending Transactions and Accrued Income [Member] | Level 2 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 [7] 0 [7]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 [7] 0 [7]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 [7] 0 [7]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 [7] 0 [7]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 [7] 0 [7]  
Other Pending Transactions and Accrued Income [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 [8] 0 [8]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 [8] 0 [8]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 [8] 0 [8]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 [8] 0 [8]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 [8] 0 [8]  
Other Pending Transactions and Accrued Income [Member] | Level 3 [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 [7] 0 [7]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 [7] 0 [7]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 [7] 0 [7]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 [7] 0 [7]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 [7] 0 [7]  
Other Pending Transactions and Accrued Income [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 [8] 0 [8]  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 [8] 0 [8]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 [8] 0 [8]  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 [8] 0 [8]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 [8] 0 [8]  
Other Pending Transactions and Accrued Income [Member] | Fair Value Inputs Other [Member] | Pension Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 (26) [7] 1 [7]  
Pension and Other Postretirement Plans' Assets      
Asset Class (26) [7] 1 [7]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 (26) [7] 1 [7]  
Actual Return on Plan Assets      
Fair Value of Plan Assets (26) [7] 1 [7]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets (26) [7] 1 [7]  
Other Pending Transactions and Accrued Income [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 (6) [8] 3 [8]  
Pension and Other Postretirement Plans' Assets      
Asset Class (6) [8] 3 [8]  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 (6) [8] 3 [8]  
Actual Return on Plan Assets      
Fair Value of Plan Assets (6) [8] 3 [8]  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets (6) [8] 3 [8]  
International Equities [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 46 49  
Pension and Other Postretirement Plans' Assets      
Asset Class 46 49  
Year End Allocation      
Total 3.30% 3.30%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 46 49  
Actual Return on Plan Assets      
Fair Value of Plan Assets 46 49  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 46 49  
International Equities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
International Equities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 46 49  
Pension and Other Postretirement Plans' Assets      
Asset Class 46 49  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 46 49  
Actual Return on Plan Assets      
Fair Value of Plan Assets 46 49  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 46 49  
International Equities [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
International Equities [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
United States Bonds [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 158 163  
Pension and Other Postretirement Plans' Assets      
Asset Class 158 163  
Year End Allocation      
Total 11.20% 11.10%  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 158 163  
Actual Return on Plan Assets      
Fair Value of Plan Assets 158 163  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 158 163  
United States Bonds [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
United States Bonds [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 158 163  
Pension and Other Postretirement Plans' Assets      
Asset Class 158 163  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 158 163  
Actual Return on Plan Assets      
Fair Value of Plan Assets 158 163  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 158 163  
United States Bonds [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
United States Bonds [Member] | Fair Value Inputs Other [Member] | Other Postretirement Benefit Plans [Member]
     
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets at December 31 0 0  
Pension and Other Postretirement Plans' Assets      
Asset Class 0 0  
Reconciliation of Changes in Fair Value of Assets Classified as Level 3 in Fair Value Hierarchy for the Pension Assets      
Balance as of January 1 0 0  
Actual Return on Plan Assets      
Fair Value of Plan Assets 0 0  
Underfunded Accumulated Benefit Obligation      
Fair Value of Plan Assets 0 0  
Net Of Tax AOCI [Member] | Pension Plans [Member]
     
Recorded as      
Total of Amounts Included in AOCI and Regulatory Assets 260 244  
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012      
Total Estimated 2012 Amortization 18    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012 18    
Net Of Tax AOCI [Member] | Other Postretirement Benefit Plans [Member]
     
Recorded as      
Total of Amounts Included in AOCI and Regulatory Assets 189 152  
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012      
Total Estimated 2012 Amortization 11    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012 11    
Deferred Income Taxes [Member] | Pension Plans [Member]
     
Recorded as      
Total of Amounts Included in AOCI and Regulatory Assets 140 132  
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012      
Total Estimated 2012 Amortization 10    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012 10    
Deferred Income Taxes [Member] | Other Postretirement Benefit Plans [Member]
     
Recorded as      
Total of Amounts Included in AOCI and Regulatory Assets 102 81  
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012      
Total Estimated 2012 Amortization 6    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012 6    
Regulatory Assets [Member] | Pension Plans [Member]
     
Recorded as      
Total of Amounts Included in AOCI and Regulatory Assets 1,818 1,764  
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012      
Total Estimated 2012 Amortization 116    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012 116    
Regulatory Assets [Member] | Other Postretirement Benefit Plans [Member]
     
Recorded as      
Total of Amounts Included in AOCI and Regulatory Assets 479 388  
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012      
Total Estimated 2012 Amortization 25    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2012 $ 25    
[1] Represents existing assets or liabilities that were previously categorized as Level 2.
[2] Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.
[3] Represents existing assets or liabilities that were previously categorized as Level 3.
[4] Rates are for base pay only. In addition, an amount is added to reflect target incentive compensation for exempt employees and overtime and incentive pay for nonexempt employees.
[5] Amounts in "Other" column primarily represent an obligation to repay cash collateral received as part of the Securities Lending Program.
[6] Amounts in "Other" column primarily represent foreign currency holdings.
[7] Amounts in "Other" column primarily represent accrued interest, dividend receivables and transactions pending settlement.
[8] Amounts in "Other" column primarily represent accrued interest, dividend receivables and transactions pending settlement