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Leases - Other Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Operating cash flows for operating leases $ 116
Financing cash flows for finance leases 18
Non-cash change in lease liabilities arising from obtaining new right of use assets or modifications, operating leases 77
Non-cash change in lease liabilities arising from obtaining new right of use assets or modifications, finance leases $ 27
Weighted-average remaining lease term (in years):  
Operating lease, weighted-average lease term 11 years
Finance lease, weighted-average lease term 6 years
Weighted-average discount rate:  
Operating lease, weighted-average discount rate 4.40%
Finance lease, weighted-average discount rate 7.10%
Equity Method Investees  
Lessee, Lease, Description [Line Items]  
Non-cash change in lease liabilities arising from obtaining new right of use assets or modifications, finance leases $ 12