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Amortized Cost and Fair Value of Investments in Debt Securities by Estimated Average Life (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 19,130 [1] $ 19,459 [2]
Distribution of Maturities: Amortized Cost, 1 Year or Less 1,863  
Distribution of Maturities: Amortized Cost, 1-5 Years 9,565  
Distribution of Maturities: Amortized Cost, 5-10 Years 18,046  
Distribution of Maturities: Amortized Cost, After 10 Years 1,069  
Distribution of Maturities: Amortized Cost, Total 30,543  
Distribution of Maturities: Fair Value, 1 Year or Less 1,958  
Distribution of Maturities: Fair Value, 1-5 Years 9,682  
Distribution of Maturities: Fair Value, 5-10 Years 17,791  
Distribution of Maturities: Fair Value, After 10 Years 1,058  
Distribution of Maturities: Fair Value, Total $ 30,489  
Available For Sale Securities Debt Maturities, Yield, One Year Or Less [3] 3.16%  
Available For Sale Securities Debt Maturities, Yield, After One Through Five Years [3] 2.32%  
Available For Sale Securities Debt Maturities, Yield, After Five Through Ten Years [3] 2.60%  
Available For Sale Securities Debt Maturities, Yield, After Ten Years [3] 2.98%  
Available For Sale Securities Debt Maturities, Yield [3] 2.56%  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss $ 362 [4] 383 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 529 [1] 464 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 8 [4] 9 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 19,659 [1] 19,923 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 370 [4] 392 [5]
US Treasury Securities [Member]    
Distribution of Maturities: Amortized Cost, 1 Year or Less 0  
Distribution of Maturities: Amortized Cost, 1-5 Years 2,345  
Distribution of Maturities: Amortized Cost, 5-10 Years 3,143  
Distribution of Maturities: Amortized Cost, After 10 Years 0  
Distribution of Maturities: Amortized Cost, Total 5,488  
Distribution of Maturities: Fair Value, 1 Year or Less 0  
Distribution of Maturities: Fair Value, 1-5 Years 2,334  
Distribution of Maturities: Fair Value, 5-10 Years 3,088  
Distribution of Maturities: Fair Value, After 10 Years 0  
Distribution of Maturities: Fair Value, Total 5,422  
US Government Agencies Debt Securities [Member]    
Distribution of Maturities: Amortized Cost, 1 Year or Less 110  
Distribution of Maturities: Amortized Cost, 1-5 Years 82  
Distribution of Maturities: Amortized Cost, 5-10 Years 7  
Distribution of Maturities: Amortized Cost, After 10 Years 98  
Distribution of Maturities: Amortized Cost, Total 297  
Distribution of Maturities: Fair Value, 1 Year or Less 112  
Distribution of Maturities: Fair Value, 1-5 Years 85  
Distribution of Maturities: Fair Value, 5-10 Years 7  
Distribution of Maturities: Fair Value, After 10 Years 98  
Distribution of Maturities: Fair Value, Total 302  
US States and Political Subdivisions Debt Securities [Member]    
Distribution of Maturities: Amortized Cost, 1 Year or Less 9  
Distribution of Maturities: Amortized Cost, 1-5 Years 32  
Distribution of Maturities: Amortized Cost, 5-10 Years 117  
Distribution of Maturities: Amortized Cost, After 10 Years 161  
Distribution of Maturities: Amortized Cost, Total 319  
Distribution of Maturities: Fair Value, 1 Year or Less 9  
Distribution of Maturities: Fair Value, 1-5 Years 33  
Distribution of Maturities: Fair Value, 5-10 Years 122  
Distribution of Maturities: Fair Value, After 10 Years 158  
Distribution of Maturities: Fair Value, Total 322  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Distribution of Maturities: Amortized Cost, 1 Year or Less 1,709  
Distribution of Maturities: Amortized Cost, 1-5 Years 7,000  
Distribution of Maturities: Amortized Cost, 5-10 Years 14,287  
Distribution of Maturities: Amortized Cost, After 10 Years 795  
Distribution of Maturities: Amortized Cost, Total 23,791  
Distribution of Maturities: Fair Value, 1 Year or Less 1,802  
Distribution of Maturities: Fair Value, 1-5 Years 7,119  
Distribution of Maturities: Fair Value, 5-10 Years 14,088  
Distribution of Maturities: Fair Value, After 10 Years 786  
Distribution of Maturities: Fair Value, Total 23,795  
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Distribution of Maturities: Amortized Cost, 1 Year or Less 0  
Distribution of Maturities: Amortized Cost, 1-5 Years 68  
Distribution of Maturities: Amortized Cost, 5-10 Years 0  
Distribution of Maturities: Amortized Cost, After 10 Years 0  
Distribution of Maturities: Amortized Cost, Total 68  
Distribution of Maturities: Fair Value, 1 Year or Less 0  
Distribution of Maturities: Fair Value, 1-5 Years 71  
Distribution of Maturities: Fair Value, 5-10 Years 0  
Distribution of Maturities: Fair Value, After 10 Years 0  
Distribution of Maturities: Fair Value, Total 71  
Commercial Mortgage Backed Securities [Member]    
Distribution of Maturities: Amortized Cost, 1 Year or Less 20  
Distribution of Maturities: Amortized Cost, 1-5 Years 12  
Distribution of Maturities: Amortized Cost, 5-10 Years 492  
Distribution of Maturities: Amortized Cost, After 10 Years 15  
Distribution of Maturities: Amortized Cost, Total 539  
Distribution of Maturities: Fair Value, 1 Year or Less 20  
Distribution of Maturities: Fair Value, 1-5 Years 12  
Distribution of Maturities: Fair Value, 5-10 Years 486  
Distribution of Maturities: Fair Value, After 10 Years 16  
Distribution of Maturities: Fair Value, Total 534  
Asset-backed Securities [Member]    
Distribution of Maturities: Amortized Cost, 1 Year or Less 0  
Distribution of Maturities: Amortized Cost, 1-5 Years 7  
Distribution of Maturities: Amortized Cost, 5-10 Years 0  
Distribution of Maturities: Amortized Cost, After 10 Years 0  
Distribution of Maturities: Amortized Cost, Total 7  
Distribution of Maturities: Fair Value, 1 Year or Less 0  
Distribution of Maturities: Fair Value, 1-5 Years 9  
Distribution of Maturities: Fair Value, 5-10 Years 0  
Distribution of Maturities: Fair Value, After 10 Years 0  
Distribution of Maturities: Fair Value, Total 9  
Other Debt Obligations [Member]    
Distribution of Maturities: Amortized Cost, 1 Year or Less 15  
Distribution of Maturities: Amortized Cost, 1-5 Years 19  
Distribution of Maturities: Amortized Cost, 5-10 Years 0  
Distribution of Maturities: Amortized Cost, After 10 Years 0  
Distribution of Maturities: Amortized Cost, Total 34  
Distribution of Maturities: Fair Value, 1 Year or Less 15  
Distribution of Maturities: Fair Value, 1-5 Years 19  
Distribution of Maturities: Fair Value, 5-10 Years 0  
Distribution of Maturities: Fair Value, After 10 Years 0  
Distribution of Maturities: Fair Value, Total 34  
Temporarily Impaired Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 19,130 19,443
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss 362 [4] 383 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 512 463
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 8 [4] 9 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 19,642 19,906
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 370 [4] 392 [5]
Temporarily Impaired Securities [Member] | US Treasury Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,108 4,380
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss 71 [4] 86 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 0 [4] 0 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,108 4,380
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 71 [4] 86 [5]
Temporarily Impaired Securities [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 94 96
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss 1 [4] 2 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3 3
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 0 [4] 0 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 97 99
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 1 [4] 2 [5]
Temporarily Impaired Securities [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 147 149
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss 4 [4] 5 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 0 [4] 0 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 147 149
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 4 [4] 5 [5]
Temporarily Impaired Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 14,445 14,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss 280 [4] 285 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 500 451
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 7 [4] 8 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 14,945 15,073
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 287 [4] 293 [5]
Temporarily Impaired Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 325 184
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss 6 [4] 5 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 0 [4] 0 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 325 184
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 6 [4] 5 [5]
Temporarily Impaired Securities [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss 0 [4] 0 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5 5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 0 [4] 0 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 5 5
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 0 [4] 0 [5]
Temporarily Impaired Securities [Member] | Other Debt Obligations [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 11 12
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss 0 [4] 0 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 0 [4] 0 [5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 11 12
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss $ 0 [4] $ 0 [5]
[1] OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings.
[2] OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings.
[3] Weighted average yields are based on amortized cost.
[4] Unrealized losses less than $0.5 million are presented as zero within the table.
[5] Unrealized losses less than $0.5 million are presented as zero within the table.