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Supplementary Insurance Information - Table (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 1,037 | $ 1,682 | $ 1,216
Reserves for future policy benefits, claims and unpaid losses and LAE | 51,250 | 46,992 | 43,652
Unearned premiums | 2,830 | 2,595 | 2,410
Net earned premiums | 5,207 | 4,889 | 4,601
Net investment income | 2,303 | 2,094 | 1,831
Benefits, claims, losses and settlement expenses | 4,458 | 4,041 | 3,873
Amortization of deferred policy acquisition costs | 923 | 860 | 690
Other operating expenses | 1,748 | 1,610 | 1,578
Net written premiums (excluding life) | 5,345 | 5,026 | 4,754
Property and casualty insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 322 | 299 | 270
Reserves for future policy benefits, claims and unpaid losses and LAE | 10,232 | 9,741 | 9,678
Unearned premiums | 2,830 | 2,595 | 2,410
Net earned premiums | 5,185 | 4,865 | 4,579
Net investment income | 472 | 438 | 362
Benefits, claims, losses and settlement expenses | 3,271 | 3,003 | 2,955
Amortization of deferred policy acquisition costs | 721 | 644 | 556
Other operating expenses | 1,027 | 957 | 867
Net written premiums (excluding life) | 5,342 | 5,023 | 4,751
Annuity |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 696 | 1,360 | 920
Reserves for future policy benefits, claims and unpaid losses and LAE | 40,406 | 36,616 | 33,316
Net investment income | 1,792 | 1,638 | 1,458
Benefits, claims, losses and settlement expenses | 1,151 | 998 | 892
Amortization of deferred policy acquisition costs | 198 | 212 | 130
Other operating expenses | 189 | 174 | 159
Other |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 19 | 23 | 26
Reserves for future policy benefits, claims and unpaid losses and LAE | 612 | 635 | 658
Net earned premiums | 22 | 24 | 22
Net investment income | 39 | 18 | 11
Benefits, claims, losses and settlement expenses | 36 | 40 | 26
Amortization of deferred policy acquisition costs | 4 | 4 | 4
Other operating expenses | 532 | 479 | 552
Net written premiums (excluding life) | $ 3 | $ 3 | $ 3

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