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Business Segments (Balance Sheet Information) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | $ 5,438 | $ 5,484
Insurance receivables | 3,187 | 2,974
Deferred acquisition costs | 806 | 737
Goodwill | 144 | 148
Deferred non-insurance warranty acquisition expense | 3,671 | 3,476
Insurance reserves |  |
Claim and claim adjustment expenses | 25,099 | 24,174
Unearned premiums | 6,374 | 5,761
Future policy benefits | 10,151 | 13,236
Deferred non-insurance warranty revenue | 4,714 | 4,503
Operating Segments | Specialty |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 1,384 | 1,200
Insurance receivables | 1,082 | 1,136
Deferred acquisition costs | 381 | 363
Goodwill | 117 | 117
Deferred non-insurance warranty acquisition expense | 3,671 | 3,476
Insurance reserves |  |
Claim and claim adjustment expenses | 6,878 | 6,433
Unearned premiums | 3,193 | 3,001
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 4,714 | 4,503
Operating Segments | Commercial |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 1,062 | 923
Insurance receivables | 1,728 | 1,488
Deferred acquisition costs | 321 | 278
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 9,395 | 8,890
Unearned premiums | 2,425 | 2,066
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 0 | 0
Operating Segments | International |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 414 | 381
Insurance receivables | 369 | 340
Deferred acquisition costs | 104 | 96
Goodwill | 27 | 31
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 2,403 | 2,280
Unearned premiums | 653 | 585
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 0 | 0
Operating Segments | Life & Group |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 101 | 401
Insurance receivables | 8 | 6
Deferred acquisition costs | 0 | 0
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 3,674 | 3,754
Unearned premiums | 103 | 109
Future policy benefits | 10,151 | 13,236
Deferred non-insurance warranty revenue | 0 | 0
Operating Segments | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 2,477 | 2,579
Insurance receivables | 0 | 4
Deferred acquisition costs | 0 | 0
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 2,749 | 2,817
Unearned premiums | 0 | 0
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 0 | 0
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 0 | 0
Insurance receivables | 0 | 0
Deferred acquisition costs | 0 | 0
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 0 | 0
Unearned premiums | 0 | 0
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | $ 0 | $ 0

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