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Contingencies and Commitments - Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]          
Right-of-use assets $ 400   $ 400   $ 423
Lease liabilities, current 108   108   109
Lease liabilities, non-current $ 298   $ 298   $ 325
Other information:          
Weighted-average remaining lease term 5 years 7 months 6 days   5 years 7 months 6 days   5 years 7 months 6 days
Weighted-average discount rate 2.83%   2.83%   2.57%
Operating lease cost $ 35 $ 27 $ 102 $ 94