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Condensed Financial Information of Registrant - Narrative (Details) - Parent Company - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Document Information [Line Items] |  |  |
Noncash capital contributions | $ 630 | $ 434 | $ 146
Stock issued | $ 529 |  |
Noncash capital distributions |  | $ 43 | $ 891

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