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Leases - Lease Cost and Other Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease, Cost [Abstract]    
Finance lease cost $ 3 $ 0
Operating lease cost 100 109
Short-term lease cost 3 3
Variable lease cost 6 6
Sublease income (17) (17)
Total lease cost 95 101
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 101 104
Financing cash flows from finance leases 1 0
Right-of-use assets obtained in exchange for new finance lease liabilities 5 0
Right-of-use assets obtained in exchange for new operating lease liabilities $ 4 $ 215
Finance leases:    
Weighted average remaining lease term (in years) 1 year 1 month 6 days  
Weighted average discount rate 4.79%  
Operating Leases [Abstract]    
Weighted average remaining lease term (in years) 5 years 3 months 18 days 7 years 9 months 18 days
Weighted average discount rate 5.63% 5.72%