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Leases - Lease-related Assets and Liabilities recorded on the Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Assets
Operating lease assets	$ 58	$ 0
Finance lease assets	90
Total lease assets	148
Liabilities
Current portion of operating lease liability	20	0
Current portion of finance lease liability	32	17
Noncurrent portion of operating lease liability	44	0
Long-term finance lease obligations	54	$ 30
Total lease liabilities	$ 150
Weighted-average remaining lease term
Weighted-average remaining lease term, operating leases	3 years 9 months 10 days
Weighted-average remaining lease term, finance leases	2 years 7 months 2 days
Weighted-average discount rate
Weighted-average discount rate, operating leases (percentage)	5.00%
Weighted-average discount rate, finance leases (percentage)	4.70%

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-Section 45
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