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Reinsurance - Premiums and contract charges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effects of reinsurance on revenue      
Direct premiums and contract charges $ 743 $ 734 $ 715
Total premiums and contract charges 1,399 1,393 1,309
Direct life and annuity contract benefits 1,062 1,003 999
Contract benefits, net of reinsurance 1,446 1,430 1,387
Effects of reinsurance on cost and expenses      
Direct interest credited to contractholder funds 533 546 598
Ceded interest credited to contractholder funds (44) (46) (46)
Interest credited to contractholder funds 601 639 677
Reinsurance recoverables      
Reinsurance recoverable $ 2,605 $ 2,680  
A- | Reinsurer Concentration Risk | Allstate Financial      
Reinsurance recoverables      
Concentration risk, percentage 78.00% 77.00%  
Annuities      
Reinsurance recoverables      
Reinsurance recoverable $ 1,369 $ 1,357  
Life insurance      
Reinsurance recoverables      
Reinsurance recoverable 1,183 1,243  
Other      
Reinsurance recoverables      
Reinsurance recoverable 53 80  
Affiliate      
Effects of reinsurance on revenue      
Assumed premiums and contract charges 241 227 138
Ceded premiums and contract charges (51) (52) (53)
Assumed life and annuity contract benefits 149 130 90
Life and annuity contract benefits, reinsurance ceded (35) (33) (36)
Effects of reinsurance on cost and expenses      
Assumed interest credited to contractholder funds 8 8 9
Ceded interest credited to contractholder funds (20) (21) (21)
Reinsurance recoverables      
Reinsurance recoverable 420 437  
Non-affiliate      
Effects of reinsurance on revenue      
Assumed premiums and contract charges 741 772 803
Ceded premiums and contract charges (275) (288) (294)
Assumed life and annuity contract benefits 484 505 522
Life and annuity contract benefits, reinsurance ceded (214) (175) (188)
Effects of reinsurance on cost and expenses      
Assumed interest credited to contractholder funds 104 131 116
Ceded interest credited to contractholder funds $ (24) $ (25) $ (25)