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INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Available for sale:    
Due in one year or less [1] $ 348  
Due after one year through five years [1] 3,910  
Due after five years through 10 years [1] 11,813  
Due after 10 years [1] 62,547  
Mortgage- and asset-backed securities [1] 317  
Total fixed maturity securities, available for sale, amortized cost 78,935 [1],[2] $ 75,132 [3]
Held to maturity:    
Due in one year or less 498  
Due after one year through five years 353  
Due after five years through 10 years 1,585  
Due after 10 years 28,807  
Mortgage- and asset-backed securities 16  
Total fixed maturity securities, held to maturity, amortized cost 31,259 31,430
Available for sale:    
Due in one year or less [1] 359  
Due after one year through five years [1] 4,070  
Due after five years through 10 years [1] 11,912  
Due after 10 years [1] 69,193  
Mortgage- and asset-backed securities [1] 347  
Total fixed maturity securities, available for sale, fair value [4] 85,881 [1],[2] 84,313 [3]
Held to maturity:    
Due in one year or less 505  
Due after one year through five years 366  
Due after five years through 10 years 1,715  
Due after 10 years 35,353  
Mortgage- and asset-backed securities 17  
Total fixed maturity securities, held to maturity, fair value $ 37,956 $ 38,072
[1] Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)
[2] Includes perpetual securities ($1,446 at amortized cost and $1,612 at fair value)
[3] Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)
[4] Includes perpetual securities