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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Loss Contingencies [Line Items]        
Legal fees $ 10 $ 9 $ 31 $ 36
Contractual Obligation $ 83   $ 83  
Contractual Obligation, Term of Contract 5 years   5 years  
Litigation and regulatory matters | Min        
Loss Contingencies [Line Items]        
Estimate of possible loss $ 8   $ 8  
Litigation and regulatory matters | Max        
Loss Contingencies [Line Items]        
Estimate of possible loss $ 15   $ 15