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Supplementary Insurance Information - Table (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 1,682 | $ 1,216 | $ 1,239
Reserves for future policy benefits, claims and unpaid losses and LAE | 46,992 | 43,652 | 39,161
Unearned premiums | 2,595 | 2,410 | 2,171
Net earned premiums | 4,889 | 4,601 | 4,352
Net investment income | 2,094 | 1,831 | 1,696
Benefits, claims, losses and settlement expenses | 4,041 | 3,873 | 3,595
Amortization of deferred policy acquisition costs | 860 | 690 | 673
Other operating expenses | 1,610 | 1,578 | 1,443
Net written premiums (excluding life) | 5,026 | 4,754 | 4,389
Property and casualty insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 299 | 270 | 238
Reserves for future policy benefits, claims and unpaid losses and LAE | 9,741 | 9,678 | 8,563
Unearned premiums | 2,595 | 2,410 | 2,171
Net earned premiums | 4,865 | 4,579 | 4,328
Net investment income | 438 | 362 | 350
Benefits, claims, losses and settlement expenses | 3,003 | 2,955 | 2,762
Amortization of deferred policy acquisition costs | 644 | 556 | 520
Other operating expenses | 957 | 867 | 870
Net written premiums (excluding life) | 5,023 | 4,751 | 4,386
Annuity |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 1,360 | 920 | 981
Reserves for future policy benefits, claims and unpaid losses and LAE | 36,616 | 33,316 | 29,907
Net investment income | 1,638 | 1,458 | 1,356
Benefits, claims, losses and settlement expenses | 998 | 892 | 800
Amortization of deferred policy acquisition costs | 212 | 130 | 149
Other operating expenses | 174 | 159 | 142
Other |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 23 | 26 | 20
Reserves for future policy benefits, claims and unpaid losses and LAE | 635 | 658 | 691
Net earned premiums | 24 | 22 | 24
Net investment income | 18 | 11 | (10)
Benefits, claims, losses and settlement expenses | 40 | 26 | 33
Amortization of deferred policy acquisition costs | 4 | 4 | 4
Other operating expenses | 479 | 552 | 431
Net written premiums (excluding life) | $ 3 | $ 3 | $ 3

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