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