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Contingencies and Commitments - Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]          
Right-of-use assets $ 404   $ 404   $ 423
Lease liabilities, current 109   109   109
Lease liabilities, non-current $ 306   $ 306   $ 325
Other information:          
Weighted-average remaining lease term 5 years 9 months 18 days   5 years 9 months 18 days   5 years 7 months 6 days
Weighted-average discount rate 2.74%   2.74%   2.57%
Operating lease cost $ 31 $ 31 $ 67 $ 67