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%