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Investments (Supplemental Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net Investment Income [Line Items] |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (86) | $ 177 | $ (153)
Net investment gains (losses) | (1,262) | 1,529 | (110)
Gains (losses) on leveraged leases and renewable energy partnerships | 33 | 12 | 87
Foreign Currency Transaction Gain (Loss), Realized | 182 | (10) | 79
Realized Investment Gains (Losses) | (880) | 711 | 634
Debt and Equity Securities, Realized Gain (Loss) | (725) | 1,229 | 1,056
Net investment income |  |  |
Net Investment Income [Line Items] |  |  |
Debt and Equity Securities, Realized Gain (Loss) | 155 | 518 | 422
Cash Flow Hedging [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Net investment gains (losses) | 19 | 82 | 207
Cash Flow Hedging [Member] | Foreign Currency Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Net Investment Income [Line Items] |  |  |
Net investment gains (losses) | 38 | 88 | 129
Equity Securities |  |  |
Net Investment Income [Line Items] |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (89) | $ 77 | $ (127)

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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714 + Details
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