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Derivatives (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value Assets | $ 11,411 | $ 10,466 |
Estimated Fair Value Liabilities | 6,975 | 3,852 |
Maximum Amount of Future Payments under Credit Default Swaps | 11,512 | 8,626 |
Estimated Fair Value of Credit Default Swaps | 105 | 165 |
Excess cash collateral received on derivatives | 252 | $ 172 |
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged | $ 0 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Average Remaining Maturity | 4 years 8 months 12 days | 4 years 7 months 6 days |
Net investment gains (losses) | $ (1,262) | $ 1,529 | $ (110)
Derivative Instrument Detail [Abstract] |  |  |
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges | $ 30 | $ (1) | 21
Hedging exposure to variability in future cash flows for specific length of time | 6 years | 7 years |
Accumulated Other Comprehensive Income Loss | $ 2,000 | $ 2,100 |
Deferred net gains (losses) expected to be reclassified to earnings | 156 |  |
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges | 435 | 303 |
Excess securities collateral provided on derivatives | 125 | 126 |
Ba [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Maximum Amount of Future Payments under Credit Default Swaps | 87 | 102 |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 0 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Average Remaining Maturity | 2 years 1 month 6 days | 2 years |
Nonperformance Risk [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Embedded derivative gains (losses) | $ 18 | $ (17) | (10)
Over the Counter [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 5,432 | 6,948 |
Excess securities collateral received on derivatives | (398) | (160) |
Excess securities collateral provided on derivatives | (1,200) | (243) |
Exchange Cleared [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 35 | 421 |
Excess securities collateral provided on derivatives | (1,000) | (1,200) |
Exchange Traded [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0 |
Excess securities collateral provided on derivatives | (184) | (185) |
Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net investment gains (losses) | 19 | 82 | $ 207
Credit Index Product [Member] | Ba [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Maximum Amount of Future Payments under Credit Default Swaps | 25 | 20 |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ (1) |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Average Remaining Maturity | 4 years | 5 years |
Accrued Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value Assets | $ 166 | $ 130 |
Estimated Fair Value Liabilities | $ 0 | $ (23) |

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
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