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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Other comprehensive income $ 60 $ 128
Net Effect of Exchange Rate Fluctuations    
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Balance at beginning of the period (889) (723)
Change before reclassifications 46 120
Other comprehensive income 46 120
Balance at end of the period (843) (603)
Change in Certain Derivative Instruments    
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Balance at beginning of the period (18) (12)
Change before reclassifications (2)  
Amounts reclassified from accumulated other comprehensive income (loss) 3 (4)
Translation effect 2 (1)
Tax effect 2  
Other comprehensive income 5 (5)
Balance at end of the period (13) (17)
Employee Benefit Plans    
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Balance at beginning of the period (1,061) (1,091)
Change before reclassifications (2) (4)
Amounts reclassified from accumulated other comprehensive income (loss) 13 17
Translation effect (5) (6)
Other comprehensive income 6 7
Balance at end of the period (1,055) (1,084)
Accumulated Other Comprehensive Loss.    
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax    
Balance at beginning of the period (1,968) (1,826)
Change before reclassifications 42 116
Amounts reclassified from accumulated other comprehensive income (loss) 16 13
Translation effect (3) (7)
Tax effect 2  
Other comprehensive income 57 122
Balance at end of the period $ (1,911) $ (1,704)