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Basis of Presentation and Summary of Significant Accounting Policies Cash and Cash equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Accounting Policies [Abstract]      
Cash and Cash Equivalents, at Carrying Value $ 449 $ 338 $ 1,681
Restricted Cash Included in Other Assets 7   9
Funds held for clients included in other current assets 36   28
Cash included in settlement processing assets included in other current assets 205   21
Cash, Cash Equivalents, Restricted Cash and Restricted Cash at end of period $ 697   $ 1,739