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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | $ 15,215 | $ 8,094
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,217) | (128)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 4,432 | 1,241
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (764) | (75)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 19,647 | 9,335
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (1,982) | (203)
No Recorded Allowance for Credit Losses [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 15,213 |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,217) |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 4,432 |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (764) |
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 19,645 |
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (1,982) |
Due In One Year Or Less [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 989 | 130
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (19) | (2)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 40 | 137
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (7) | (12)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 1,029 | 267
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (26) | (14)
Due In One Year Through Five Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 4,935 | 2,165
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (383) | (35)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 1,645 | 446
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (209) | (29)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 6,580 | 2,612
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (592) | (64)
Due In Five Years Through Ten Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 2,698 | 1,728
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (360) | (47)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 911 | 244
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (230) | (22)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 3,609 | 1,972
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (590) | (69)
Due After Ten Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 672 | 792
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (91) | (16)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 408 | 51
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (116) | (3)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 1,080 | 843
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (207) | (19)
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 3,204 | 1,954
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (142) | (11)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 456 | 42
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (29) | (1)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 3,661 | 1,996
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (171) | (12)
Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 2,715 | 1,325
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (222) | (15)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 972 | 320
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (173) | (10)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 3,687 | 1,646
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (395) | $ (25)
Recorded an Allowance for Credit Losses [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 2 |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation |  |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value |  |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  |
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 2 |
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total |  |

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