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Schedule I—Condensed Financial Information of Registrant (Parent Company Only) (Transactions With Affiliates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule I—Condensed Financial Information of Registrant (Parent Company Only) [Abstract]
Receivables from affiliates	$ 0
Dividends received	56	$ 43	$ 40
Affiliate	$ 187	$ 285

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