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Reinsurance - Premiums and contract charges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effects of reinsurance on revenue      
Direct premiums and contract charges $ 734 $ 715 $ 728
Total premiums and contract charges 1,393 1,309 1,338
Direct life and annuity contract benefits 1,003 999 1,023
Contract benefits, net of reinsurance 1,430 1,387 1,406
Effects of reinsurance on cost and expenses      
Direct interest credited to contractholder funds 546 598 636
Ceded interest credited to contractholder funds (46) (46) (40)
Interest credited to contractholder funds 639 677 717
Reinsurance recoverables      
Reinsurance recoverable $ 2,680 $ 2,791  
A- | Reinsurer Concentration Risk | Allstate Financial      
Reinsurance recoverables      
Concentration risk, percentage 77.00% 77.00%  
Annuities      
Reinsurance recoverables      
Reinsurance recoverable $ 1,357 $ 1,411  
Life insurance      
Reinsurance recoverables      
Reinsurance recoverable 1,243 1,299  
Other      
Reinsurance recoverables      
Reinsurance recoverable 80 81  
Affiliate      
Effects of reinsurance on revenue      
Assumed premiums and contract charges 227 138 131
Ceded premiums and contract charges (52) (53) (41)
Assumed life and annuity contract benefits 130 90 79
Life and annuity contract benefits, reinsurance ceded (33) (36) (32)
Effects of reinsurance on cost and expenses      
Assumed interest credited to contractholder funds 8 9 10
Ceded interest credited to contractholder funds (21) (21) (16)
Reinsurance recoverables      
Reinsurance recoverable 437 452  
Non-affiliate      
Effects of reinsurance on revenue      
Assumed premiums and contract charges 772 803 835
Ceded premiums and contract charges (288) (294) (315)
Assumed life and annuity contract benefits 505 522 541
Life and annuity contract benefits, reinsurance ceded (175) (188) (205)
Effects of reinsurance on cost and expenses      
Assumed interest credited to contractholder funds 131 116 111
Ceded interest credited to contractholder funds $ (25) $ (25) $ (24)