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Leases - Operating lease payments (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
2019	$ 10	$ 18
2020	18	17
2021	11	11
2022	10	9
2023	9	8
2024	6	5
2025 and thereafter	19	20
Total future minimum lease payments	83	88
Less: imputed interest	(11)
Total operating lease liabilities	72
Operating lease liabilities	17	0
Operating lease liabilities, noncurrent	55	$ 0
Future Minimum Payments Due	$ 4

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

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-SubTopic 20
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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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