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Supplemental Equity and Comprehensive Income Information (Details 1) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss)      
Balance at Beginning of Period $ (4,750) $ (5,025) $ (3,543)
Other comprehensive income (loss), before tax:      
Amounts before reclassification 801 (62) (2,754)
Amounts reclassified out 691 543 608
Total other comprehensive income (loss), before tax 1,492 481 (2,146)
Tax effect (655) (206) 664
Total other comprehensive income (loss), net of tax 837 275 (1,482)
Balance at End of Period (3,913) (4,750) (5,025)
Cumulative Translation Adjustment
     
Accumulated Other Comprehensive Income (Loss)      
Balance at Beginning of Period 230 114 374
Other comprehensive income (loss), before tax:      
Amounts before reclassification (462) 133 (253)
Amounts reclassified out 0 0 0
Total other comprehensive income (loss), before tax (462) 133 (253)
Tax effect 44 (17) (7)
Total other comprehensive income (loss), net of tax (418) 116 (260)
Balance at End of Period (188) 230 114
Defined Benefit Pension and Postretirement Plans Adjustment
     
Accumulated Other Comprehensive Income (Loss)      
Balance at Beginning of Period (4,955) (5,155) (3,879)
Other comprehensive income (loss), before tax:      
Amounts before reclassification 1,361 (204) (2,452)
Amounts reclassified out 569 615 475
Total other comprehensive income (loss), before tax 1,930 411 (1,977)
Tax effect (690) (211) 701
Total other comprehensive income (loss), net of tax 1,240 200 (1,276)
Balance at End of Period (3,715) (4,955) (5,155)
Debt and Equity Securities, Unrealized Gain (Loss)
     
Accumulated Other Comprehensive Income (Loss)      
Balance at Beginning of Period (2) (6) (6)
Other comprehensive income (loss), before tax:      
Amounts before reclassification 0 6 (10)
Amounts reclassified out 0 0 10
Total other comprehensive income (loss), before tax 0 6 0
Tax effect 0 (2) 0
Total other comprehensive income (loss), net of tax 0 4 0
Balance at End of Period (2) (2) (6)
Cash Flow Hedging Instruments Unrealized Gain (Loss)
     
Accumulated Other Comprehensive Income (Loss)      
Balance at Beginning of Period (23) 22 (32)
Other comprehensive income (loss), before tax:      
Amounts before reclassification (98) 3 (39)
Amounts reclassified out 122 (72) 123
Total other comprehensive income (loss), before tax 24 (69) 84
Tax effect (9) 24 (30)
Total other comprehensive income (loss), net of tax 15 (45) 54
Balance at End of Period $ (8) $ (23) $ 22