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Business Segments (Balance Sheet Information) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | $ 5,484 | $ 4,478
Insurance receivables | 2,974 | 2,640
Deferred acquisition costs | 737 | 708
Goodwill | 148 | 148
Deferred non-insurance warranty acquisition expense | 3,476 | 3,068
Insurance reserves |  |
Claim and claim adjustment expenses | 24,174 | 22,706
Unearned premiums | 5,761 | 5,119
Future policy benefits | 13,236 | 13,318
Deferred non-insurance warranty revenue | 4,503 | 4,023
Operating Segments | Specialty |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 1,200 | 886
Insurance receivables | 1,136 | 1,052
Deferred acquisition costs | 363 | 330
Goodwill | 117 | 117
Deferred non-insurance warranty acquisition expense | 3,476 | 3,068
Insurance reserves |  |
Claim and claim adjustment expenses | 6,433 | 5,748
Unearned premiums | 3,001 | 2,635
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 4,503 | 4,023
Operating Segments | Commercial |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 923 | 848
Insurance receivables | 1,488 | 1,254
Deferred acquisition costs | 278 | 281
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 8,890 | 8,250
Unearned premiums | 2,066 | 1,824
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 0 | 0
Operating Segments | International |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 381 | 302
Insurance receivables | 340 | 328
Deferred acquisition costs | 96 | 97
Goodwill | 31 | 31
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 2,280 | 2,091
Unearned premiums | 585 | 546
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 0 | 0
Operating Segments | Life & Group |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 401 | 390
Insurance receivables | 6 | 4
Deferred acquisition costs | 0 | 0
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 3,754 | 3,743
Unearned premiums | 109 | 114
Future policy benefits | 13,236 | 13,318
Deferred non-insurance warranty revenue | 0 | 0
Operating Segments | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 2,579 | 2,052
Insurance receivables | 4 | 2
Deferred acquisition costs | 0 | 0
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 2,817 | 2,874
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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