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Fair Value of Assets and Liabilities - Level 3 Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Assets    
Balance at beginning of period $ 467 $ 514
Total gains (losses) included in: Net income 1 5
Total gains (losses) included in: OCI (4) 8
Transfers into Level 3 6 3
Transfers out of Level 3 (13) (12)
Purchases 22 13
Sales (5) (1)
Issues 0 0
Settlements (5) (8)
Balance at end of period 469 522
Liabilities    
Balance at beginning of period (284) (289)
Total gains (losses) included in: net income 23 3
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Sales 0 0
Issues (1) (1)
Settlements 2 2
Balance at end of period (260) (285)
Fair value, assets and liabilities gain (loss) included in earnings 24 8
Other investments: Free-standing derivatives 1 1
Free-standing derivatives, liabilities   2
Municipal    
Assets    
Balance at beginning of period 57 59
Total gains (losses) included in: Net income 0 0
Total gains (losses) included in: OCI (1) 1
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 0 0
Balance at end of period 56 60
Corporate - public    
Assets    
Balance at beginning of period 49 47
Total gains (losses) included in: Net income 0 1
Total gains (losses) included in: OCI (1) 0
Transfers into Level 3 3 0
Transfers out of Level 3 0 (10)
Purchases 0 0
Sales (1) 0
Issues 0 0
Settlements (3) (2)
Balance at end of period 47 36
Corporate - privately placed    
Assets    
Balance at beginning of period 220 264
Total gains (losses) included in: Net income 0 0
Total gains (losses) included in: OCI (2) 5
Transfers into Level 3 0 0
Transfers out of Level 3 (13) 0
Purchases 11 0
Sales 0 0
Issues 0 0
Settlements (1) (1)
Balance at end of period 215 268
ABS - CDO    
Assets    
Balance at beginning of period 10 27
Total gains (losses) included in: Net income 0 (1)
Total gains (losses) included in: OCI 0 2
Transfers into Level 3 0 3
Transfers out of Level 3 0 0
Purchases 0 5
Sales 0 0
Issues 0 0
Settlements 0 (4)
Balance at end of period 10 32
ABS - consumer and other    
Assets    
Balance at beginning of period 40 42
Total gains (losses) included in: Net income 0 0
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 3 0
Transfers out of Level 3 0 (2)
Purchases 3 8
Sales (4) 0
Issues 0 0
Settlements (1) (1)
Balance at end of period 41 47
Fixed income securities    
Assets    
Balance at beginning of period 376 439
Total gains (losses) included in: Net income 0 0
Total gains (losses) included in: OCI (4) 8
Transfers into Level 3 6 3
Transfers out of Level 3 (13) (12)
Purchases 14 13
Sales (5) 0
Issues 0 0
Settlements (5) (8)
Balance at end of period 369 443
Equity securities    
Assets    
Balance at beginning of period 90 76
Total gains (losses) included in: Net income 1 5
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 8 0
Sales 0 (1)
Issues 0 0
Settlements 0 0
Balance at end of period 99 80
Free-standing derivatives, net    
Assets    
Balance at beginning of period 1 (2)
Total gains (losses) included in: Net income 0 1
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 0 0
Balance at end of period 1 (1)
Other assets    
Assets    
Balance at beginning of period   1
Total gains (losses) included in: Net income   (1)
Total gains (losses) included in: OCI   0
Transfers into Level 3   0
Transfers out of Level 3   0
Purchases   0
Sales   0
Issues   0
Settlements   0
Balance at end of period   0
Contractholder funds: Derivatives embedded in life and annuity contracts    
Liabilities    
Balance at beginning of period (284) (289)
Total gains (losses) included in: net income 23 3
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Sales 0 0
Issues (1) (1)
Settlements 2 2
Balance at end of period (260) (285)
Realized capital gains and losses    
Assets    
Total gains (losses) included in: Net income 1 1
Liabilities    
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 1 1
(Loss) gain reclassified from AOCI into income (net investment income)    
Assets    
Total gains (losses) included in: Net income   5
Liabilities    
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date   5
Interest credited to contractholder funds    
Assets    
Total gains (losses) included in: Net income 19 (5)
Liabilities    
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 19 (5)
Contract benefits    
Liabilities    
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date $ 4 $ 7