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Accumulated Other Comprehensive Income (Components) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (3,400) $ (3,154)
Other comprehensive income before reclassifications 225 (110)
Amounts reclassified from accumulated other comprehensive income 7 29
Other comprehensive income 232 (81)
Balance at end of period (3,168) (3,235)
Defined Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,524) (1,690)
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income 17 23
Other comprehensive income 17 23
Balance at end of period (1,507) (1,667)
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,879) (1,446)
Other comprehensive income before reclassifications 207 (125)
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income 207 (125)
Balance at end of period (1,672) (1,571)
Gains and Losses on Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period 3 (18)
Other comprehensive income before reclassifications 18 15
Amounts reclassified from accumulated other comprehensive income (10) 6
Other comprehensive income 8 21
Balance at end of period $ 11 $ 3