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Securities Available for Sale (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Sep. 30, 2019  
Amortized Cost $ 30,572 $ 31,910
Unrealized Gains 792 142
Unrealized Losses 6 610
Available-for-sale Securities [1] 31,358 31,442
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,915 4,277
Unrealized Gains 103 0
Unrealized Losses 0 66
Available-for-sale Securities 4,018 4,211
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 123 221
Unrealized Gains 1 2
Unrealized Losses 0 2
Available-for-sale Securities 124 221
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 564 606
Unrealized Gains 9 4
Unrealized Losses 1 21
Available-for-sale Securities 572 589
Other Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 12 14
Unrealized Gains 0 0
Unrealized Losses 0 0
Available-for-sale Securities 12 14
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,881 2,688
Unrealized Gains 103 8
Unrealized Losses 1 69
Available-for-sale Securities 2,983 2,627
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,008 943
Unrealized Gains 56 0
Unrealized Losses 0 27
Available-for-sale Securities 1,064 916
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 22,069 23,161
Unrealized Gains 520 128
Unrealized Losses 4 425
Available-for-sale Securities $ 22,585 $ 22,864
[1] Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $151 million and $222 million at September 30, 2019 and December 31, 2018, respectively.