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Description of Business and Significant Accounting Policies - (Tables)
6 Months Ended
Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Contract with Customer, Contract Asset, Contract Liability, and Receivable
The change in the balance of the Recovery Credit unsatisfied performance obligation was as follows:
June 30, 2021
(in millions)Three Months EndedSix Months Ended
Balance at beginning of period$77 $92 
(+) Accruals5 17 
(-) Distributions to clients(19)(46)
Balance at end of period$63 $63