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Fair Value Measurements - Assets and liabilities measured and carried at fair value in the financial statements (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Available for sale (AFS) fixed maturities $ 38,379 $ 34,544
Trading fixed maturities 348 359
Assets of managed investment entities (MIE) 4,902 4,765
Variable annuity assets (separate accounts) [1] 644 600
Derivatives including equity index call options and other assets 701 492
Total assets accounted for at fair value 46,636 42,319
Liabilities:    
Liabilities of managed investment entities 4,687 4,549
Total liabilities accounted for at fair value 7,264 6,337
Derivatives in annuity benefits accumulated    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities 2,542 1,759
Derivatives in long-term debt    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities   (1)
Other liabilities — derivatives    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities 35 30
Fixed maturities    
Assets:    
Available for sale (AFS) fixed maturities 38,379 34,544
Trading fixed maturities 348 359
U.S. Government and government agencies    
Assets:    
Available for sale (AFS) fixed maturities 242 315
States, municipalities and political subdivisions    
Assets:    
Available for sale (AFS) fixed maturities 7,123 6,781
Foreign government    
Assets:    
Available for sale (AFS) fixed maturities 127 136
Residential MBS    
Assets:    
Available for sale (AFS) fixed maturities 3,227 3,635
Commercial MBS    
Assets:    
Available for sale (AFS) fixed maturities 962 1,493
Asset-backed securities (“ABS”)    
Assets:    
Available for sale (AFS) fixed maturities 7,962 5,959
Corporate and other    
Assets:    
Available for sale (AFS) fixed maturities 18,736 16,225
Equity securities    
Assets:    
Equity securities — AFS and trading 1,662 1,558
Other assets — derivatives    
Assets:    
Derivatives including equity index call options and other assets 0 1
Level 1    
Assets:    
Assets of managed investment entities (MIE) 307 380
Variable annuity assets (separate accounts) [1] 0 0
Total assets accounted for at fair value 1,914 1,877
Liabilities:    
Liabilities of managed investment entities 293 363
Total liabilities accounted for at fair value 293 363
Level 1 | Derivatives in annuity benefits accumulated    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities 0 0
Level 1 | Derivatives in long-term debt    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities   0
Level 1 | Other liabilities — derivatives    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities 0 0
Level 1 | Fixed maturities    
Assets:    
Available for sale (AFS) fixed maturities 152 162
Trading fixed maturities 44 30
Level 1 | U.S. Government and government agencies    
Assets:    
Available for sale (AFS) fixed maturities 122 133
Level 1 | States, municipalities and political subdivisions    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Foreign government    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Residential MBS    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Commercial MBS    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Asset-backed securities (“ABS”)    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Corporate and other    
Assets:    
Available for sale (AFS) fixed maturities 30 29
Level 1 | Equity securities    
Assets:    
Equity securities — AFS and trading 1,411 1,305
Level 1 | Other assets — derivatives    
Assets:    
Derivatives including equity index call options and other assets 0 0
Level 2    
Assets:    
Assets of managed investment entities (MIE) 4,572 4,356
Variable annuity assets (separate accounts) [1] 644 600
Total assets accounted for at fair value 42,432 38,680
Liabilities:    
Liabilities of managed investment entities 4,372 4,158
Total liabilities accounted for at fair value 4,407 4,187
Level 2 | Derivatives in annuity benefits accumulated    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities 0 0
Level 2 | Derivatives in long-term debt    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities   (1)
Level 2 | Other liabilities — derivatives    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities 35 30
Level 2 | Fixed maturities    
Assets:    
Available for sale (AFS) fixed maturities 36,125 32,823
Trading fixed maturities 304 329
Level 2 | U.S. Government and government agencies    
Assets:    
Available for sale (AFS) fixed maturities 112 174
Level 2 | States, municipalities and political subdivisions    
Assets:    
Available for sale (AFS) fixed maturities 6,975 6,641
Level 2 | Foreign government    
Assets:    
Available for sale (AFS) fixed maturities 127 136
Level 2 | Residential MBS    
Assets:    
Available for sale (AFS) fixed maturities 3,105 3,445
Level 2 | Commercial MBS    
Assets:    
Available for sale (AFS) fixed maturities 926 1,468
Level 2 | Asset-backed securities (“ABS”)    
Assets:    
Available for sale (AFS) fixed maturities 7,218 5,475
Level 2 | Corporate and other    
Assets:    
Available for sale (AFS) fixed maturities 17,662 15,484
Level 2 | Equity securities    
Assets:    
Equity securities — AFS and trading 86 79
Level 2 | Other assets — derivatives    
Assets:    
Derivatives including equity index call options and other assets 0 1
Level 3    
Assets:    
Assets of managed investment entities (MIE) 23 29
Variable annuity assets (separate accounts) [1] 0 0
Total assets accounted for at fair value 2,290 1,762
Liabilities:    
Liabilities of managed investment entities 22 28
Total liabilities accounted for at fair value 2,564 1,787
Level 3 | Derivatives in annuity benefits accumulated    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities 2,542 1,759
Level 3 | Derivatives in long-term debt    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities   0
Level 3 | Other liabilities — derivatives    
Liabilities:    
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities 0 0
Level 3 | Fixed maturities    
Assets:    
Available for sale (AFS) fixed maturities 2,102 1,559
Trading fixed maturities 0 0
Level 3 | U.S. Government and government agencies    
Assets:    
Available for sale (AFS) fixed maturities 8 8
Level 3 | States, municipalities and political subdivisions    
Assets:    
Available for sale (AFS) fixed maturities 148 140
Level 3 | Foreign government    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 3 | Residential MBS    
Assets:    
Available for sale (AFS) fixed maturities 122 190
Level 3 | Commercial MBS    
Assets:    
Available for sale (AFS) fixed maturities 36 25
Level 3 | Asset-backed securities (“ABS”)    
Assets:    
Available for sale (AFS) fixed maturities 744 484
Level 3 | Corporate and other    
Assets:    
Available for sale (AFS) fixed maturities 1,044 712
Level 3 | Equity securities    
Assets:    
Equity securities — AFS and trading 165 174
Level 3 | Other assets — derivatives    
Assets:    
Derivatives including equity index call options and other assets 0 0
Equity index call options | Equity index call options    
Assets:    
Derivatives including equity index call options and other assets 701 492
Equity index call options | Level 1 | Equity index call options    
Assets:    
Derivatives including equity index call options and other assets 0 0
Equity index call options | Level 2 | Equity index call options    
Assets:    
Derivatives including equity index call options and other assets 701 492
Equity index call options | Level 3 | Equity index call options    
Assets:    
Derivatives including equity index call options and other assets $ 0 $ 0
[1] Variable annuity liabilities equal the fair value of variable annuity assets.