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Schedule I—Condensed Financial Information of Registrant (Parent Company Only) (Transactions With Affiliates) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule I—Condensed Financial Information of Registrant (Parent Company Only) [Abstract] |  |  |
Receivables from affiliates | $ 0 |  |
Dividends received | 76 | $ 56 | $ 43
Affiliate | $ 171 | $ 187 |

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