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Adoption of ASU 2018-12 (Summary of Restated Consolidated Statements of Stockholders Equity) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2021
Balance |  |  | $ 5,102 |  |
Net income (loss) | $ 511 | $ 840 | (370) | $ 2,321 |
Other comprehensive income (loss), net of tax | (1,350) | (5,595) | 1,248 | (12,264) |
Balance | 5,819 | 9,331 | 5,819 | 9,331 |
Retained Earnings [Member] |  |  |  |  |
Balance | 4,940 | 6,354 | 5,924 | 5,196 |
Net income (loss) | 511 | 840 | (370) | 2,321 |
Balance | 5,362 | 7,065 | 5,362 | 7,065 | $ 5,196
Retirement of common stock/cancellation of shares |  | (51) |  | (296) |
Common stock dividends declared | (78) | (78) | (156) | (156) |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Balance | (3,754) | 3,315 | (6,352) | 9,984 |
Other comprehensive income (loss), net of tax | (1,350) | (5,595) | 1,248 | (12,264) | 9,984
Balance | $ (5,104) | (2,280) | (5,104) | (2,280) | 9,984
Accounting Standards Update 2018-12 [Member] |  |  |  |  |
Net income (loss) |  | 840 |  |  |
Other comprehensive income (loss), net of tax |  | (5,595) |  |  |
Balance |  | 9,331 |  | 9,331 |
Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] |  |  |  |  |
Balance |  | 6,354 |  |  |
Net income (loss) |  | 840 |  |  |
Balance |  | 7,065 |  | 7,065 |
Accounting Standards Update 2018-12 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Balance |  | 3,315 |  |  |
Other comprehensive income (loss), net of tax |  | (5,595) |  |  |
Balance |  | (2,280) |  | (2,280) |
Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |  |  |
Balance |  |  | 4,569 |  |
Net income (loss) |  | 228 |  | 319 |
Other comprehensive income (loss), net of tax |  | (5,589) |  | (10,778) |
Balance |  | 9,654 |  | 9,654 |
Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] | Retained Earnings [Member] |  |  |  |  |
Balance |  | 9,346 |  | 9,578 |
Net income (loss) |  | 228 |  | 319 |
Balance |  | 9,445 |  | 9,445 | 9,578
Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Balance |  | 1,252 |  |  |
Other comprehensive income (loss), net of tax |  | (5,589) |  | (10,778) | 6,441
Balance |  | (4,337) |  | (4,337) |
Accounting Standards Update 2018-12 [Member] | Restatement Impacts [Member] |  |  |  |  |
Balance |  |  | $ 533 |  |
Net income (loss) |  | 612 |  | 2,002 |
Other comprehensive income (loss), net of tax |  | (6) |  | (1,486) |
Balance |  | (323) |  | (323) |
Accounting Standards Update 2018-12 [Member] | Restatement Impacts [Member] | Retained Earnings [Member] |  |  |  |  |
Balance |  | (2,992) |  | (4,382) |
Net income (loss) |  | 612 |  | 2,002 |
Balance |  | (2,380) |  | (2,380) | (4,382)
Accounting Standards Update 2018-12 [Member] | Restatement Impacts [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Balance |  | 2,063 |  |  |
Other comprehensive income (loss), net of tax |  | (6) |  | (1,486) | $ 3,543
Balance |  | $ 2,057 |  | $ 2,057 |

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