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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of period $ 41 $ 37 $ 29
Additions related to acquisitions 0 0 13
Additions for prior year tax positions 1 20 1
Lapse of statute of limitations 0 (1) (3)
Settlements 0 (15) (2)
Foreign currency translation, decrease 2 0  
Foreign currency translation     (1)
Balance at end of period $ 44 $ 41 $ 37