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Securities with Unrealized Losses (Detail) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
US Treasury Securities | Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value $ 2,010
Less than twelve months, Unrealized Losses 45
Twelve months or longer, Fair Value 0
Twelve months or longer, Unrealized Losses 0
Total, Fair Value 2,010
Total, Unrealized Losses 45
US Government Agencies Debt Securities | Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value341,426
Less than twelve months, Unrealized Losses07
Twelve months or longer, Fair Value00
Twelve months or longer, Unrealized Losses00
Total, Fair Value341,426
Total, Unrealized Losses07
US States and Political Subdivisions Debt Securities | Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value245
Less than twelve months, Unrealized Losses01
Twelve months or longer, Fair Value3235
Twelve months or longer, Unrealized Losses22
Total, Fair Value3480
Total, Unrealized Losses23
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value523,497
Less than twelve months, Unrealized Losses028
Twelve months or longer, Fair Value00
Twelve months or longer, Unrealized Losses00
Total, Fair Value523,497
Total, Unrealized Losses028
Mortgage-backed Securities, Issued by Private Enterprises | Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value918
Less than twelve months, Unrealized Losses00
Twelve months or longer, Fair Value2217
Twelve months or longer, Unrealized Losses33
Total, Fair Value3135
Total, Unrealized Losses33
Collateralized Debt Obligations | Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value333 
Less than twelve months, Unrealized Losses5 
Twelve months or longer, Fair Value0 
Twelve months or longer, Unrealized Losses0 
Total, Fair Value333 
Total, Unrealized Losses5 
Asset-backed Securities | Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value00
Less than twelve months, Unrealized Losses00
Twelve months or longer, Fair Value1114
Twelve months or longer, Unrealized Losses54
Total, Fair Value1114
Total, Unrealized Losses54
Corporate And Other Debt Securities | Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value00
Less than twelve months, Unrealized Losses00
Twelve months or longer, Fair Value23
Twelve months or longer, Unrealized Losses11
Total, Fair Value23
Total, Unrealized Losses11
Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value4306,996
Less than twelve months, Unrealized Losses581
Twelve months or longer, Fair Value6769
Twelve months or longer, Unrealized Losses1110
Total, Fair Value4977,065
Total, Unrealized Losses1691
Mortgage-backed Securities, Issued by Private Enterprises | Other Than Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value18[1]0[1]
Less than twelve months, Unrealized Losses1[1]0[1]
Twelve months or longer, Fair Value220[1]286[1]
Twelve months or longer, Unrealized Losses29[1]31[1]
Total, Fair Value238[1]286[1]
Total, Unrealized Losses30[1]31[1]
Asset-backed Securities | Other Than Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value3[1]4[1]
Less than twelve months, Unrealized Losses1[1]1[1]
Twelve months or longer, Fair Value2[1]0[1]
Twelve months or longer, Unrealized Losses1[1]0[1]
Total, Fair Value5[1]4[1]
Total, Unrealized Losses2[1]1[1]
Other Than Temporarily Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value21[1]4[1]
Less than twelve months, Unrealized Losses2[1]1[1]
Twelve months or longer, Fair Value222[1]286[1]
Twelve months or longer, Unrealized Losses30[1]31[1]
Total, Fair Value243[1]290[1]
Total, Unrealized Losses32[1]32[1]
Impaired Securities
  
Investments, Unrealized Loss Position [Line Items]  
Less than twelve months, Fair Value4517,000
Less than twelve months, Unrealized Losses782
Twelve months or longer, Fair Value289355
Twelve months or longer, Unrealized Losses4141
Total, Fair Value7407,355
Total, Unrealized Losses$ 48$ 123
[1]Includes OTTI securities for which credit losses have been recorded in earnings in current or prior periods.