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Contingencies and Commitments - Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]          
Right-of-use assets $ 469   $ 469   $ 419
Lease liabilities, current 118   118   112
Lease liabilities, non-current $ 353   $ 353   $ 310
Other information:          
Weighted-average remaining lease term 5 years 7 months 6 days   5 years 7 months 6 days   5 years 4 months 24 days
Weighted-average discount rate 2.66%   2.66%   2.86%
Operating lease cost $ 38 $ 31 $ 73 $ 67