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Leases - Operating Lease Payments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
2019	$ 5	$ 18
2020	19	17
2021	11	11
2022	10	9
2023	9	8
2024	6	5
2025 and thereafter	19	20
Total future minimum lease payments	79	88
Less: imputed interest	(10)
Total operating lease liabilities	69
Operating lease liabilities	17	0
Operating lease liabilities, noncurrent	$ 52	$ 0

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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-SubTopic 20
-Section 50
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