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Deferred Policy Acquisition Costs - Progression of deferred policy acquisition costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]      
Deferred policy acquisition costs and present value of future profits, beginning balance $ 1,239 $ 1,184 $ 821
Deferred policy acquisition costs and present value of future profits, additions 817 774 754
Deferred policy acquisition costs and present value of future profits, periodic amortization (744) (722) (710)
Deferred policy acquisition costs and present value of future profits, annuity unlocking 41 29 35
Deferred policy acquisition costs and present value of future profits, change included in realized gains 10 8 9
Deferred policy acquisition costs and present value of future profits, sale of subsidiaries     (19)
Deferred policy acquisition costs and present value of future profits, foreign currency translation 0 (3) (3)
Deferred policy acquisition costs and present value of future profits, other 10    
Deferred policy acquisition costs and present value of future profits, change in unrealized (157) (31) 297
Deferred policy acquisition costs and present value of future profits, ending balance 1,216 1,239 1,184
Property and casualty insurance      
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Deferred policy acquisition costs, beginning balance 238 226 221
Deferred policy acquisition costs, additions 588 535 519
Deferred policy acquisition costs, periodic amortization (556) (520) (511)
Deferred policy acquisition costs, foreign currency translation 0 (3) (3)
Deferred policy acquisition costs, ending balance 270 238 226
Annuity and Run-off Long-term Care and Life      
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Deferred policy acquisition costs, beginning balance 1,110 1,018 925
Deferred policy acquisition costs, additions 225 230 224
Deferred policy acquisition costs, periodic amortization (161) (169) (162)
Deferred policy acquisition costs, annuity unlocking 34 25 31
Deferred policy acquisition costs, change included in realized gains 9 6 8
Deferred policy acquisition costs, sale of subsidiaries     (8)
Deferred policy acquisition costs, ending balance 1,217 1,110 1,018
Movement in Deferred Sales Inducements [Roll Forward]      
Deferred sales inducements, beginning balance 110 119 132
Deferred sales inducements, additions 4 9 11
Deferred sales inducements, periodic amortization (19) (24) (26)
Deferred sales inducements, annuity unlocking 6 4 4
Deferred sales inducements, change included in realized gains 1 2 1
Deferred sales inducements, sale of subsidiaries     (3)
Deferred sales inducements, ending balance 102 110 119
Movement in Present Value of Future Insurance Profits [Roll Forward]      
Present value of future profits, beginning balance 46 55 74
Present value of future profits, periodic amortization (8) (9) (11)
Present value of future profits, annuity unlocking 1 0 0
Present value of future profits, sale of subsidiaries     (8)
Present value of future profits, other 10    
Present value of future profits, ending balance 49 46 55
Movement in Unrealized Gains (Losses) Related to Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]      
Unrealized investment gains (losses), beginning balance [1] (265) (234) (531)
Unrealized investment gains (losses), change in unrealized [1] (157) (31) 297
Unrealized investment gains (losses), ending balance [1] (422) (265) (234)
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]      
Deferred policy acquisition costs and present value of future profits, beginning balance 1,001 958 600
Deferred policy acquisition costs and present value of future profits, additions 229 239 235
Deferred policy acquisition costs and present value of future profits, periodic amortization (188) (202) (199)
Deferred policy acquisition costs and present value of future profits, annuity unlocking 41 29 35
Deferred policy acquisition costs and present value of future profits, change included in realized gains 10 8 9
Deferred policy acquisition costs and present value of future profits, sale of subsidiaries     (19)
Deferred policy acquisition costs and present value of future profits, other 10    
Deferred policy acquisition costs and present value of future profits, change in unrealized (157) (31) 297
Deferred policy acquisition costs and present value of future profits, ending balance 946 1,001 958
Excluding Unrealized Gains | Annuity and Run-off Long-term Care and Life      
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]      
Deferred policy acquisition costs and present value of future profits, beginning balance 1,266 1,192 1,131
Deferred policy acquisition costs and present value of future profits, change in unrealized 0 0 0
Deferred policy acquisition costs and present value of future profits, ending balance $ 1,368 $ 1,266 $ 1,192
[1] Unrealized adjustments to DPAC includes net unrealized gains/losses on securities and net unrealized gains/losses on cash flow hedges.