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Leases - Lease Cost and Other Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Lease, Cost [Abstract]  
Operating lease cost $ 23
Variable lease cost 1
Sublease income (4)
Total lease cost 20
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases 21
Right-of-use assets obtained in exchange for new operating lease liabilities $ 214
Weighted-average remaining lease term  
Finance leases 2 years 9 months 18 days
Operating leases 8 years 2 months 12 days
Weighted-average discount rate  
Finance leases 6.50%
Operating leases 5.70%