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Leases - Other Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other information    
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 60 $ 55
Right-of-use assets obtained in exchange for lease liabilities: Operating leases $ 76 $ 212
Weighted average remaining lease term (years): Operating leases 5 years 6 months 5 years 6 months
Weighted average discount rate: Operating leases 4.90% 5.70%