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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 1,014    
Other comprehensive (loss) income 11 $ 30 $ (62)
Ending Balance 689 1,014  
Net Investment Hedge [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (25) (40) 22
Other comprehensive (loss) income 15 15 (62)
Ending Balance (10) (25) (40)
Cash Flow Hedge [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 6 0 0
Other comprehensive (loss) income (4) 6 0
Ending Balance 2 6 0
Currency Translation Adjustment [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (233) (158) (358)
Other comprehensive (loss) income 2 (75) 200
Ending Balance (231) (233) (158)
Employee Benefits [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (312) (244) (241)
Other comprehensive (loss) income 202 (68) (3)
Ending Balance (110) (312) (244)
Accumulated Other Comprehensive (Loss) Income [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (564) (442) (577)
Other comprehensive (loss) income 215 (122) 135
Ending Balance $ (349) $ (564) $ (442)