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Accumulated Other Comprehensive Income (Components) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (3,154) $ (2,765)
Other comprehensive income (loss) before reclassifications (164) (369)
Amounts reclassified from accumulated other comprehensive income 43 45
Other comprehensive income (loss) (121) (324)
Balance at end of period (3,275) (3,089)
Defined Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,690) (1,781)
Other comprehensive income (loss) before reclassifications (13) 16
Amounts reclassified from accumulated other comprehensive income 38 32
Other comprehensive income (loss) 25 48
Balance at end of period (1,665) (1,733)
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,446) (980)
Other comprehensive income (loss) before reclassifications (170) (357)
Amounts reclassified from accumulated other comprehensive income
Other comprehensive income (loss) (170) (357)
Balance at end of period (1,616) (1,337)
Gains and Losses on Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (18) (4)
Other comprehensive income (loss) before reclassifications 19 (28)
Amounts reclassified from accumulated other comprehensive income 5 13
Other comprehensive income (loss) 24 (15)
Balance at end of period $ 6 $ (19)