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Financial Instruments not Carried at Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Investments:    
Mortgage loans, net of allowance $ 12,379 $ 10,929
Policy loans 1,015 1,030
Liabilities    
Short-term debt 407 0
Long-term debt 771 793
Level 2 [Member]    
Liabilities    
Long-term debt 927 977
Level 3 [Member]    
Liabilities    
Investment contracts 40,113 34,711
Short-term debt 407  
Long-term debt 71 93
Mortgage loans held-for-investment [Member] | Level 3 [Member]    
Investments:    
Investments 12,167 10,876
Policy loans [Member] | Level 3 [Member]    
Investments:    
Investments 1,015 1,030
Other [Member] | Level 3 [Member]    
Investments:    
Investments 84 78
Fair Value [Member]    
Liabilities    
Investment contracts 40,113 34,711
Short-term debt 407  
Long-term debt 999 1,070
Fair Value [Member] | Mortgage loans held-for-investment [Member]    
Investments:    
Investments 12,167 10,876
Fair Value [Member] | Policy loans [Member]    
Investments:    
Investments 1,015 1,030
Fair Value [Member] | Other [Member]    
Investments:    
Investments 84 78
Carrying Value [Member]    
Liabilities    
Investment contracts 42,094 36,746
Short-term debt 407  
Long-term debt 771 793
Carrying Value [Member] | Mortgage loans held-for-investment [Member]    
Investments:    
Mortgage loans, net of allowance 12,379 10,929
Carrying Value [Member] | Policy loans [Member]    
Investments:    
Policy loans 1,015 1,030
Carrying Value [Member] | Other [Member]    
Investments:    
Other investments $ 84 $ 78