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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Other comprehensive income (loss) $ 128 $ 194
Net Effect of Exchange Rate Fluctuations    
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Balance at beginning of the period (723) (788)
Change before reclassifications 120 186
Other comprehensive income (loss) 120 186
Balance at end of the period (603) (602)
Change in Certain Derivative Instruments    
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Balance at beginning of the period (12) (4)
Amounts reclassified from accumulated other comprehensive income (4) (6)
Translation effect (1)  
Other comprehensive income (loss) (5) (6)
Balance at end of the period (17) (10)
Employee Benefit Plans    
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Balance at beginning of the period (1,091) (1,380)
Change before reclassifications (4) (12)
Amounts reclassified from accumulated other comprehensive income 17 19
Translation effect (6) 4
Other comprehensive income (loss) 7 11
Balance at end of the period (1,084) (1,369)
Accumulated Other Comprehensive Loss.    
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Balance at beginning of the period (1,826) (2,172)
Change before reclassifications 116 174
Amounts reclassified from accumulated other comprehensive income 13 13
Translation effect (7) 4
Other comprehensive income (loss) 122 191
Balance at end of the period $ (1,704) $ (1,981)