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Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Assets    
Separate account assets [1] $ 58,749 $ 65,650
Liabilities    
Short term security value 1,892 1,406
Equity securities   79
Trading Security   74
Fair Value, Measurements, Recurring [Member]    
Assets    
Asset-backed securities 55,415 51,773
Derivative instruments - assets 567 1,155
Separate account assets 95,667 [2] 104,958
Assets at fair value 151,649 157,886
Liabilities    
Future policy benefits and claims [3] 627 984
Derivative instruments - liabilities 60 178
Liabilities at fair value 687 1,162
Short term security value 1,900  
Equity securities 121  
Trading Security 67  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets    
Asset-backed securities 2,921 2,046
Separate account assets 94,259 [2] 103,532
Assets at fair value 97,180 105,578
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets    
Asset-backed securities 51,460 48,651
Derivative instruments - assets 129 85
Separate account assets 1,328 [2] 1,365
Assets at fair value 52,917 50,101
Liabilities    
Derivative instruments - liabilities 46 166
Liabilities at fair value 46 166
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets    
Asset-backed securities 1,034 1,076
Derivative instruments - assets 438 1,070
Separate account assets 80 [2] 61
Assets at fair value 1,552 2,207
Liabilities    
Future policy benefits and claims [3] 627 984
Derivative instruments - liabilities 14 12
Liabilities at fair value 641 996
Fixed maturity securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Asset-backed securities 53,337 50,201
Fixed maturity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets    
Asset-backed securities 2,043 1,645
Fixed maturity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets    
Asset-backed securities 50,265 47,494
Fixed maturity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets    
Asset-backed securities 1,029 1,062
Fixed maturity securities [Member] | U.S. Treasury securities and obligations of U.S. Government corporations and agencies [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Asset-backed securities 486 396
Fixed maturity securities [Member] | U.S. Treasury securities and obligations of U.S. Government corporations and agencies [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets    
Asset-backed securities 485 395
Fixed maturity securities [Member] | U.S. Treasury securities and obligations of U.S. Government corporations and agencies [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets    
Asset-backed securities 1 1
Fixed maturity securities [Member] | Obligations of states, political subdivisions and foreign governments [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Asset-backed securities 4,293 3,845
Fixed maturity securities [Member] | Obligations of states, political subdivisions and foreign governments [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets    
Asset-backed securities 53 60
Fixed maturity securities [Member] | Obligations of states, political subdivisions and foreign governments [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets    
Asset-backed securities 4,235 3,780
Fixed maturity securities [Member] | Obligations of states, political subdivisions and foreign governments [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets    
Asset-backed securities 5 5
Fixed maturity securities [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Asset-backed securities 41,233 39,441
Fixed maturity securities [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets    
Asset-backed securities 40,345 38,529
Fixed maturity securities [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets    
Asset-backed securities 888 912
Fixed maturity securities [Member] | Residential mortgage-backed securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Asset-backed securities 2,823 2,872
Fixed maturity securities [Member] | Residential mortgage-backed securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets    
Asset-backed securities 1,505 1,190
Fixed maturity securities [Member] | Residential mortgage-backed securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets    
Asset-backed securities 1,318 1,682
Fixed maturity securities [Member] | Commercial mortgage-backed securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Asset-backed securities 1,721 1,161
Fixed maturity securities [Member] | Commercial mortgage-backed securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets    
Asset-backed securities 1,721 1,161
Fixed maturity securities [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Asset-backed securities 2,781 2,486
Fixed maturity securities [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets    
Asset-backed securities 2,646 2,342
Fixed maturity securities [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets    
Asset-backed securities 135 144
Other [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Asset-backed securities 2,078 [4] 1,572
Other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets    
Asset-backed securities 878 [4] 401
Other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets    
Asset-backed securities 1,195 [4] 1,157
Other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets    
Asset-backed securities $ 5 [4] $ 14
[1] Excludes $38.3 billion and $40.0 billion as of December 31, 2018 and 2017, respectively, of separate account assets not related to variable annuity contracts with guarantees, primarily attributable to retirement plan, variable universal life and COLI products.
[2] Excludes $1.4 billion of separate account assets that use net asset value ("NAV") as a practical expedient to estimate fair value.
[3] Amount primarily represents the fair value of interest credits associated with certain indexed life and annuity products.
[4] Includes short-term investments, equity securities and trading securities of $1.9 billion, $121 million and $67 million, respectively.