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Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income before income taxes:      
U.S. $ 74 $ 121 $ 226
Foreign 508 500 543
Income before income taxes 582 621 769
Current tax (benefit) expense:      
U.S. federal 6 17 (13)
State and local 2 1 4
Foreign 147 172 179
Total current tax expense 155 190 170
Deferred tax expense (benefit):      
U.S. federal (8) (14) 77
State and local   (2) 4
Foreign 11 (7) (14)
Total deferred tax expense (benefit) 3 (23) 67
Total provision for income taxes $ 158 $ 167 $ 237