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Investments - Securities Available-for-Sale in Gross Unrealized Loss Position (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Corporate and Other Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months $ 617 $ 4,882
Gross Unrealized Losses, Less than 12 Months 10 302
Estimated Fair Value, 12 Months or Longer 338 174
Gross Unrealized Losses, 12 Months or Longer 26 45
Total Estimated Fair Value 955 5,056
Total Gross Unrealized Losses 36 347
States, Municipalities and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 163 338
Gross Unrealized Losses, Less than 12 Months 2 8
Estimated Fair Value, 12 Months or Longer 9 75
Total Estimated Fair Value 172 413
Total Gross Unrealized Losses 2 8
Residential Mortgage-Backed [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 273 963
Gross Unrealized Losses, Less than 12 Months 6 9
Estimated Fair Value, 12 Months or Longer 212 164
Gross Unrealized Losses, 12 Months or Longer 9 8
Total Estimated Fair Value 485 1,127
Total Gross Unrealized Losses 15 17
Commercial Mortgage-Backed [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 391 652
Gross Unrealized Losses, Less than 12 Months 7 10
Estimated Fair Value, 12 Months or Longer 96 96
Gross Unrealized Losses, 12 Months or Longer 1 2
Total Estimated Fair Value 487 748
Total Gross Unrealized Losses 8 12
Other Asset-Backed [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 153 552
Gross Unrealized Losses, Less than 12 Months 1 8
Estimated Fair Value, 12 Months or Longer 17 5
Total Estimated Fair Value 170 557
Total Gross Unrealized Losses 1 8
Total Asset-Backed [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 817 2,167
Gross Unrealized Losses, Less than 12 Months 14 27
Estimated Fair Value, 12 Months or Longer 325 265
Gross Unrealized Losses, 12 Months or Longer 10 10
Total Estimated Fair Value 1,142 2,432
Total Gross Unrealized Losses 24 37
U.S. Treasury and Obligations of Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 2 4
Total Estimated Fair Value 2 4
Foreign Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 16 54
Gross Unrealized Losses, Less than 12 Months   1
Total Estimated Fair Value 16 54
Total Gross Unrealized Losses   1
Redeemable Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months   3
Total Estimated Fair Value   3
Total Fixed Maturities Available-for-Sale [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 1,615 7,448
Gross Unrealized Losses, Less than 12 Months 26 338
Estimated Fair Value, 12 Months or Longer 672 514
Gross Unrealized Losses, 12 Months or Longer 36 55
Total Estimated Fair Value 2,287 7,962
Total Gross Unrealized Losses 62 393
Common Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months   3
Gross Unrealized Losses, Less than 12 Months 1 1
Total Estimated Fair Value   3
Total Gross Unrealized Losses 1 1
Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 15 13
Gross Unrealized Losses, Less than 12 Months 2 3
Total Estimated Fair Value 15 13
Total Gross Unrealized Losses 2 3
Fixed Maturity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 1,630 7,464
Gross Unrealized Losses, Less than 12 Months 29 342
Estimated Fair Value, 12 Months or Longer 672 514
Gross Unrealized Losses, 12 Months or Longer 36 55
Total Estimated Fair Value 2,302 7,978
Total Gross Unrealized Losses $ 65 $ 397