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Investments (Fair Value of Trading Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | $ 3,498 | $ 4,482
Corporate Bonds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 2,248 | 2,734
U.S. Government Bonds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities |  | 32
Foreign Government Bonds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 49 | 73
RMBS [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 99 | 95
CMBS [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 137 | 137
ABS [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 919 | 1,338
State And Municipal Bonds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 21 | 27
Hybrid And Redeemable Preferred Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | $ 25 | $ 46

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