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Settlement Assets and Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Cash and cash equivalents $ 1,656 $ 141
Receivables 10,212 345
Total settlement assets 11,868 486
Payment instruments outstanding 345 480
Card settlements due to merchants 11,523 0
Total settlement obligations $ 11,868 $ 480