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Significant Accounting Policies and Pronouncements (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Retained earnings(2) | $ 32,352 |  |  | $ 31,714 | [1],[2] |  |  |  |
Accumulated other comprehensive income (loss) | (6,504) | [1] |  | (3,806) | [2] |  |  |  |
Total equity | $ 29,263 |  |  | 31,548 | [3] | $ 30,322 | [3] |  | $ 68,210
Loan-to-value ratios (greater than) | 100.00% |  |  |  |  |  |  |  |
Loan-to-value ratio (less than) | 100.00% |  |  |  |  |  |  |  |
Debt service coverage ratios (less than) | 1.0 |  |  |  |  |  |  |  |
Repurchase and Resale Agreements, Collateral, Percentage | 95.00% |  |  |  |  |  |  |  |
Uncertain Tax Positions Measurement Percentage (greater than) | 50.00% |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 286 |  |  | 340 |  |  |  |  |
Operating Lease, Liability | 311 |  |  | 370 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (6,504) |  |  | (3,806) |  | (9,493) |  | $ (11,658) | 30,738
Total equity | (6,504) |  |  | (3,806) | [3] | (9,493) | [3] |  | 30,738
Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Total equity |  |  | $ 16,000 |  |  |  |  | (42,400) |
Retained Earnings |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Retained earnings(2) |  |  |  |  |  |  |  | 28,137 |
Total equity | $ 32,352 |  |  | $ 31,714 | [3] | $ 35,183 | [3] |  | $ 30,749
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Total equity |  |  | $ (1,700) |  |  |  |  | $ (2,600) |
United States | Securities Lending and Securities Repurchase Transactions |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Guarantor Obligations, Liquidation Proceeds, Percentage | 102.00% |  |  |  |  |  |  |  |
Other Countries | Securities Lending and Securities Repurchase Transactions |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Guarantor Obligations, Liquidation Proceeds, Percentage | 105.00% |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful life | 3 years |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful life | 40 years |  |  |  |  |  |  |  |
[1] | See Note 24 for additional information regarding related party transactions.
[2] | Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.
[3] | Prior period amounts adjusted for the adoption of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.

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