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Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of gross amounts of unrecognized gross tax benefits    
Amount of unrecognized tax benefits, beginning balance $ 61 $ 75
Amount of decreases due to lapse of the applicable statute of limitations (5) (4)
Amount of decreases due to settlements (17) (12)
Increases as a result of tax positions taken in the current period 1 1
Increases as a result of tax positions taken in a prior period   1
Assumed in Worldpay acquisition 5  
Amount of unrecognized tax benefits, ending balance $ 45 $ 61