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Accumulated Other Comprehensive Income (Components) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (3,154) $ (2,765)
Other comprehensive income (loss) before reclassifications (110) (219)
Amounts reclassified from accumulated other comprehensive income 29 27
Other comprehensive income (loss) (81) (192)
Balance at end of period (3,235) (2,957)
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
Amounts reclassified from accumulated other comprehensive income 23 23
Other comprehensive income (loss) 23 23
Balance at end of period (1,667) (1,758)
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 (125) (206)
Amounts reclassified from accumulated other comprehensive income
Other comprehensive income (loss) (125) (206)
Balance at end of period (1,571) (1,186)
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 15 (13)
Amounts reclassified from accumulated other comprehensive income 6 4
Other comprehensive income (loss) 21 (9)
Balance at end of period $ 3 $ (13)