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Commitments and Contingencies (Purchase Commitments Narrative) (Details) - Computer data processing operations and related functions
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Other Commitments  
Contractual obligation $ 791
Minimum  
Other Commitments  
Purchase commitment term 1 year
Maximum  
Other Commitments  
Purchase commitment term 5 years