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Leases - Schedule of Leasing Activity (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease cost $ 14
Short-term lease cost 20
Total lease cost 34
Cash paid for amounts included in the measurement of lease liabilities  
Operating cash flows from capitalized operating leases 15
Right-of-use assets obtained in exchange for new operating lease liabilities $ 12
Weighted-average remaining lease term-operating 8 years
Weighted-average discount rate-operating leases 7.60%