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Leases (Schedule of Additional Lease Information) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Cash outflows for lease liabilities:
Operating cash flows, Finance lease	$ 1	$ 3
Weighted average remaining lease term (years), Finance lease	8 years 6 months	8 years 6 months
Weighted average discount rate, Finance lease	4.20%	4.20%
Operating cash flows, Operating lease		$ 1
Investing cash flows, Operating lease	$ 12	27
Right-of-use assets obtained in exchange for new lease liabilities, Operating lease	$ 1	$ 1
Weighted average remaining lease term (years), Operating lease	1 year 10 months 24 days	1 year 10 months 24 days
Weighted average discount rate, Operating lease	3.20%	3.20%

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Cash outflows for lease liabilities.

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Amount of cash outflow for operating leases, classified as investing cash flows.

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Amount of interest paid on finance lease liability.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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