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Business Segments (Balance sheet information) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | $ 5,527 | $ 5,484
Insurance receivables | 2,920 | 2,974
Deferred acquisition costs | 766 | 737
Goodwill | 147 | 148
Deferred non-insurance warranty acquisition expense | 3,504 | 3,476
Insurance reserves |  |
Claim and claim adjustment expenses | 24,348 | 24,174
Unearned premiums | 5,942 | 5,761
Future policy benefits | 11,938 | 13,236
Deferred non-insurance warranty revenue | 4,528 | 4,503
Operating Segments | Specialty |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 1,291 | 1,200
Insurance receivables | 1,055 | 1,136
Deferred acquisition costs | 370 | 363
Goodwill | 117 | 117
Deferred non-insurance warranty acquisition expense | 3,504 | 3,476
Insurance reserves |  |
Claim and claim adjustment expenses | 6,623 | 6,433
Unearned premiums | 3,029 | 3,001
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 4,528 | 4,503
Operating Segments | Commercial |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 947 | 923
Insurance receivables | 1,503 | 1,488
Deferred acquisition costs | 294 | 278
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 8,934 | 8,890
Unearned premiums | 2,161 | 2,066
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 0 | 0
Operating Segments | International |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 360 | 381
Insurance receivables | 359 | 340
Deferred acquisition costs | 102 | 96
Goodwill | 30 | 31
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 2,316 | 2,280
Unearned premiums | 624 | 585
Future policy benefits | 0 | 0
Deferred non-insurance warranty revenue | 0 | 0
Operating Segments | Life & Group |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 399 | 401
Insurance receivables | 4 | 6
Deferred acquisition costs | 0 | 0
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 3,712 | 3,754
Unearned premiums | 128 | 109
Future policy benefits | 11,938 | 13,236
Deferred non-insurance warranty revenue | 0 | 0
Operating Segments | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Reinsurance receivables | 2,530 | 2,579
Insurance receivables | (1) | 4
Deferred acquisition costs | 0 | 0
Goodwill | 0 | 0
Deferred non-insurance warranty acquisition expense | 0 | 0
Insurance reserves |  |
Claim and claim adjustment expenses | 2,763 | 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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