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Supplementary Insurance Information - Table (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs $ 1,216 $ 1,239 $ 1,184
Reserves for future policy benefits, claims and unpaid losses and LAE 43,652 39,161 35,454
Unearned premiums 2,410 2,171 2,060
Net earned premiums 4,601 4,352 4,328
Net investment income 1,831 1,696 1,633
Benefits, claims, losses and settlement expenses 3,873 3,595 3,558
Amortization of deferred policy acquisition costs 690 673 653
Other operating expenses 1,578 1,443 1,369
Net written premiums (excluding life) 4,754 4,389 4,400
Property and casualty insurance      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs 270 238 226
Reserves for future policy benefits, claims and unpaid losses and LAE 9,678 8,563 8,127
Unearned premiums 2,410 2,171 2,060
Net earned premiums 4,579 4,328 4,224
Net investment income 362 350 319
Benefits, claims, losses and settlement expenses 2,955 2,762 2,695
Amortization of deferred policy acquisition costs 556 520 511
Other operating expenses 867 870 839
Net written premiums (excluding life) 4,751 4,386 4,327
Annuity      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs 920 981 934
Reserves for future policy benefits, claims and unpaid losses and LAE 33,316 29,907 26,622
Net investment income 1,458 1,356 1,224
Benefits, claims, losses and settlement expenses 892 800 732
Amortization of deferred policy acquisition costs 130 149 136
Other operating expenses 159 142 123
Run-off long-term care and life      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs 26 20 24
Reserves for future policy benefits, claims and unpaid losses and LAE 658 691 705
Net earned premiums 22 24 104
Net investment income 20 21 80
Benefits, claims, losses and settlement expenses 26 33 131
Amortization of deferred policy acquisition costs 4 4 6
Other operating expenses 11 10 37
Net written premiums (excluding life) 3 3 73
Other      
Supplementary Insurance Information, by Segment [Line Items]      
Net investment income (9) (31) 10
Other operating expenses $ 541 $ 421 $ 370