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Schedule of Changes in Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Plan Asset      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 100.00% 100.00%  
Fair value of plan assets $ 1,376 $ 1,428 $ 1,384
Percentage of Plan Assets 100.00% 100.00%  
Pension Plan Asset | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 540 $ 595  
Pension Plan Asset | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 700 706  
Pension Plan Asset | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 136 $ 127  
Pension Plan Asset | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 6.00% 6.00%  
Fair value of plan assets $ 95 $ 85  
Percentage of Plan Assets 7.00% 6.00%  
Pension Plan Asset | Real Estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 95 $ 85  
Pension Plan Asset | REITs      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 2.00% 2.00%  
Fair value of plan assets $ 23 $ 23  
Percentage of Plan Assets 2.00% 2.00%  
Pension Plan Asset | REITs | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 23 $ 23  
Pension Plan Asset | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 8  
Pension Plan Asset | Cash | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 5 $ 8  
Pension Plan Asset | Equity Securities | U.S. large cap      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 24.00% 24.00%  
Fair value of plan assets $ 318 $ 342  
Percentage of Plan Assets 23.00% 24.00%  
Pension Plan Asset | Equity Securities | U.S. large cap | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 318 $ 342  
Pension Plan Asset | Equity Securities | U.S. small cap      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 8.00% 8.00%  
Fair value of plan assets $ 115 $ 117  
Percentage of Plan Assets 8.00% 8.00%  
Pension Plan Asset | Equity Securities | U.S. small cap | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 115 $ 117  
Pension Plan Asset | Equity Securities | International      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 20.00% 20.00%  
Fair value of plan assets $ 260 $ 274  
Percentage of Plan Assets 19.00% 19.00%  
Pension Plan Asset | Equity Securities | International | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 260 $ 274  
Pension Plan Asset | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 40.00% 40.00%  
Percentage of Plan Assets 41.00% 41.00%  
Pension Plan Asset | Fixed Income Securities | U.S. Treasury and government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 120 $ 140  
Pension Plan Asset | Fixed Income Securities | U.S. Treasury and government bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 95 121  
Pension Plan Asset | Fixed Income Securities | U.S. Treasury and government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 25 19  
Pension Plan Asset | Fixed Income Securities | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 375 377  
Pension Plan Asset | Fixed Income Securities | Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 375 377  
Pension Plan Asset | Fixed Income Securities | Mortgage-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9 4  
Pension Plan Asset | Fixed Income Securities | Mortgage-backed securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9 4  
Pension Plan Asset | Fixed Income Securities | Long duration bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 7  
Pension Plan Asset | Fixed Income Securities | Long duration bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 7  
Pension Plan Asset | Fixed Income Securities | Guarantee annuity contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49 51  
Pension Plan Asset | Fixed Income Securities | Guarantee annuity contracts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 9  
Pension Plan Asset | Fixed Income Securities | Guarantee annuity contracts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 41 $ 42  
Postretirement Benefit Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 100.00% 100.00%  
Fair value of plan assets $ 500 $ 512 $ 475
Percentage of Plan Assets 100.00% 100.00%  
Postretirement Benefit Plan Assets | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 100.00% 100.00%  
Fair value of plan assets $ 376 $ 402  
Percentage of Plan Assets 100.00% 100.00%  
Postretirement Benefit Plan Assets | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 100.00% 100.00%  
Fair value of plan assets $ 118 $ 103  
Percentage of Plan Assets 100.00% 100.00%  
Postretirement Benefit Plan Assets | Life VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 100.00% 100.00%  
Fair value of plan assets $ 6 $ 7  
Percentage of Plan Assets 100.00% 100.00%  
Postretirement Benefit Plan Assets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 316 $ 344  
Postretirement Benefit Plan Assets | Level 1 | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 192 234  
Postretirement Benefit Plan Assets | Level 1 | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 118 103  
Postretirement Benefit Plan Assets | Level 1 | Life VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 7  
Postretirement Benefit Plan Assets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 184 168  
Postretirement Benefit Plan Assets | Level 2 | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 184 168  
Postretirement Benefit Plan Assets | Cash | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 1  
Postretirement Benefit Plan Assets | Cash | Level 1 | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 2 $ 1  
Postretirement Benefit Plan Assets | Equity Securities | U.S. large cap | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 9.00% 9.00%  
Fair value of plan assets $ 32 $ 34  
Percentage of Plan Assets 9.00% 9.00%  
Postretirement Benefit Plan Assets | Equity Securities | U.S. large cap | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 21.00% 21.00%  
Fair value of plan assets $ 24 $ 22  
Percentage of Plan Assets 21.00% 21.00%  
Postretirement Benefit Plan Assets | Equity Securities | U.S. large cap | Life VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 70.00% 70.00%  
Fair value of plan assets $ 4 $ 5  
Percentage of Plan Assets 68.00% 67.00%  
Postretirement Benefit Plan Assets | Equity Securities | U.S. large cap | Level 1 | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 32 $ 34  
Postretirement Benefit Plan Assets | Equity Securities | U.S. large cap | Level 1 | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 24 22  
Postretirement Benefit Plan Assets | Equity Securities | U.S. large cap | Level 1 | Life VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 4 $ 5  
Postretirement Benefit Plan Assets | Equity Securities | U.S. small cap | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 21.00% 21.00%  
Fair value of plan assets $ 26 $ 21  
Percentage of Plan Assets 22.00% 21.00%  
Postretirement Benefit Plan Assets | Equity Securities | U.S. small cap | Level 1 | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 26 $ 21  
Postretirement Benefit Plan Assets | Equity Securities | International | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 11.00% 11.00%  
Fair value of plan assets $ 38 $ 41  
Percentage of Plan Assets 10.00% 10.00%  
Postretirement Benefit Plan Assets | Equity Securities | International | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 28.00% 28.00%  
Fair value of plan assets $ 33 $ 28  
Percentage of Plan Assets 28.00% 28.00%  
Postretirement Benefit Plan Assets | Equity Securities | International | Level 1 | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 38 $ 41  
Postretirement Benefit Plan Assets | Equity Securities | International | Level 1 | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 33 $ 28  
Postretirement Benefit Plan Assets | Fixed Income Securities | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 80.00% 80.00%  
Percentage of Plan Assets 81.00% 81.00%  
Postretirement Benefit Plan Assets | Fixed Income Securities | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00% 30.00%  
Percentage of Plan Assets 29.00% 30.00%  
Postretirement Benefit Plan Assets | Fixed Income Securities | Life VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 30.00% 30.00%  
Percentage of Plan Assets 32.00% 33.00%  
Postretirement Benefit Plan Assets | Fixed Income Securities | U.S. Treasury and government bonds | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 118 $ 155  
Postretirement Benefit Plan Assets | Fixed Income Securities | U.S. Treasury and government bonds | Level 1 | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 118 155  
Postretirement Benefit Plan Assets | Fixed Income Securities | Corporate bonds | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 184 168  
Postretirement Benefit Plan Assets | Fixed Income Securities | Corporate bonds | Level 2 | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 184 168  
Postretirement Benefit Plan Assets | Fixed Income Securities | Long duration bonds | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 3  
Postretirement Benefit Plan Assets | Fixed Income Securities | Long duration bonds | Level 1 | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 3  
Postretirement Benefit Plan Assets | Fixed Income Securities | Future and option contracts | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
Postretirement Benefit Plan Assets | Fixed Income Securities | Future and option contracts | Level 1 | Bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
Postretirement Benefit Plan Assets | Fixed Income Securities | Core fixed income bond fund | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 33 31  
Postretirement Benefit Plan Assets | Fixed Income Securities | Core fixed income bond fund | Life VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
Postretirement Benefit Plan Assets | Fixed Income Securities | Core fixed income bond fund | Level 1 | Non-bargain VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 33 31  
Postretirement Benefit Plan Assets | Fixed Income Securities | Core fixed income bond fund | Level 1 | Life VEBA      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 2 $ 2