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Leases - Lease-related Assets and Liabilities recorded on the Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Assets
Operating lease assets	$ 60	$ 0
Finance lease assets	67
Total lease assets	127
Liabilities
Current portion of operating lease liability	17	0
Current portion of finance lease liability	21	17
Noncurrent portion of operating lease liability	48	0
Finance lease liability	38	$ 30
Total lease liabilities	$ 124
Weighted-average remaining lease term
Weighted-average remaining lease term, operating leases	4 years 2 months 4 days
Weighted-average remaining lease term, finance leases	2 years 7 months 9 days
Weighted-average discount rate
Weighted-average discount rate, operating leases (percentage)	5.00%
Weighted-average discount rate, operating leases (percentage)	4.90%

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-SubTopic 20
-Section 45
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