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Contingencies and Commitments - Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]          
Right-of-use assets $ 406   $ 406   $ 384
Lease liabilities, current 92   92   86
Lease liabilities, non-current $ 320   $ 320   $ 301
Other information          
Weighted-average remaining lease term 5 years 8 months 12 days   5 years 8 months 12 days   6 years 2 months 12 days
Weighted-average discount rate 3.03%   3.03%   3.34%
Operating lease cost $ 31 $ 34 $ 67 $ 68