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Leases - Undiscounted Cash Flows under ASC 840 (Details) $ in Millions	Dec. 31, 2018 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	$ 24
2020	20
2021	12
2022	11
2023	6
Thereafter	2
Total minimum lease payments	75
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	19
2020	31
2021	0
2022	0
2023	0
Thereafter	0
Total minimum lease payments	$ 50

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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