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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax        
Other comprehensive income (loss) $ (240) $ 14 $ (111) $ 207
Net Effect of Exchange Rate Fluctuations        
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax        
Balance at beginning of the period (603) (602) (724) (788)
Change before reclassifications (253) 24 (132) 210
Other comprehensive income (loss) (253) 24 (132) 210
Balance at end of the period (856) (578) (856) (578)
Change in Certain Derivative Instruments        
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax        
Balance at beginning of the period (17) (10) (12) (4)
Change before reclassifications 18   4  
Amounts reclassified from accumulated other comprehensive income (18) (4) (9) (10)
Translation effect (1)   (1)  
Other comprehensive income (loss) (1) (4) (6) (10)
Balance at end of the period (18) (14) (18) (14)
Employee Benefit Plans        
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax        
Balance at beginning of the period (1,084) (1,369) (1,091) (1,380)
Change before reclassifications (3) (6) (7) (10)
Amounts reclassified from accumulated other comprehensive income 16 20 33 39
Translation effect 16 (10) 10 (14)
Other comprehensive income (loss) 29 4 36 15
Balance at end of the period (1,055) (1,365) (1,055) (1,365)
Accumulated Other Comprehensive Loss.        
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax        
Balance at beginning of the period (1,704) (1,981) (1,827) (2,172)
Change before reclassifications (238) 18 (135) 200
Amounts reclassified from accumulated other comprehensive income (2) 16 24 29
Translation effect 15 (10) 9 (14)
Other comprehensive income (loss) (225) 24 (102) 215
Balance at end of the period $ (1,929) $ (1,957) $ (1,929) $ (1,957)