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Investment Securities - Schedule of Gross Unrealized Losses and Fair Value of Company's Investment Securities with Unrealized Losses (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months $ 8,419
Unrealized Losses Less Than 12 Months (38)
Fair Value 12 Months or Greater 10,556
Unrealized Losses 12 Months or Greater (316)
Fair Value Total 18,975
Unrealized Losses Total (354)
Fair Value Less Than 12 Months 9,539
Unrealized Losses Less Than 12 Months (74)
Fair Value 12 Months or Greater 10,155
Unrealized Losses 12 Months or Greater (448)
Fair Value Total 19,694
Unrealized Losses Total (522)
U.S. Treasury and agencies [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months   
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater 968
Unrealized Losses 12 Months or Greater (40)
Fair Value Total 968
Unrealized Losses Total (40)
Fair Value Less Than 12 Months 109
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater 817
Unrealized Losses 12 Months or Greater (29)
Fair Value Total 926
Unrealized Losses Total (29)
Mortgage-backed securities Residential [Member] | Agency [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months 8,419
Unrealized Losses Less Than 12 Months (38)
Fair Value 12 Months or Greater 9,556
Unrealized Losses 12 Months or Greater (273)
Fair Value Total 17,975
Unrealized Losses Total (311)
Fair Value Less Than 12 Months 9,318
Unrealized Losses Less Than 12 Months (73)
Fair Value 12 Months or Greater 8,213
Unrealized Losses 12 Months or Greater (329)
Fair Value Total 17,531
Unrealized Losses Total (402)
Mortgage-backed securities Residential [Member] | Non-agency Prime [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months 16
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater 159
Unrealized Losses 12 Months or Greater (5)
Fair Value Total 175
Unrealized Losses Total (5)
Mortgage-backed securities Residential [Member] | Non-agency Non-prime [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months 59
Unrealized Losses Less Than 12 Months (1)
Fair Value 12 Months or Greater 42
Unrealized Losses 12 Months or Greater (1)
Fair Value Total 101
Unrealized Losses Total (2)
Asset-backed securities Other [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months   
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater 10
Unrealized Losses 12 Months or Greater (1)
Fair Value Total 10
Unrealized Losses Total (1)
Fair Value Less Than 12 Months 24
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater 3
Unrealized Losses 12 Months or Greater   
Fair Value Total 27
Unrealized Losses Total   
Other debt securities [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months   
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater 22
Unrealized Losses 12 Months or Greater (2)
Fair Value Total 22
Unrealized Losses Total (2)
Obligations of state and political subdivisions [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months 7
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater 355
Unrealized Losses 12 Months or Greater (9)
Fair Value Total 362
Unrealized Losses Total (9)
Obligations of foreign governments [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months 6
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater   
Unrealized Losses 12 Months or Greater   
Fair Value Total 6
Unrealized Losses Total   
Corporate debt securities [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months   
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater 443
Unrealized Losses 12 Months or Greater (64)
Fair Value Total 443
Unrealized Losses Total (64)
Perpetual preferred securities [Member]
 
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]  
Fair Value Less Than 12 Months   
Unrealized Losses Less Than 12 Months   
Fair Value 12 Months or Greater 123
Unrealized Losses 12 Months or Greater (11)
Fair Value Total 123
Unrealized Losses Total $ (11)