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Securities Available for Sale (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Jun. 30, 2019  
Amortized Cost $ 31,918 $ 31,910
Unrealized Gains 595 142
Unrealized Losses 26 610
Available-for-sale Securities [1] 32,487 31,442
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4,261 4,277
Unrealized Gains 84 0
Unrealized Losses 0 66
Available-for-sale Securities 4,345 4,211
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 140 221
Unrealized Gains 1 2
Unrealized Losses 0 2
Available-for-sale Securities 141 221
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 582 606
Unrealized Gains 9 4
Unrealized Losses 1 21
Available-for-sale Securities 590 589
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 2,999 2,688
Unrealized Gains 70 8
Unrealized Losses 8 69
Available-for-sale Securities 3,061 2,627
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,009 943
Unrealized Gains 37 0
Unrealized Losses 0 27
Available-for-sale Securities 1,046 916
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 22,915 23,161
Unrealized Gains 394 128
Unrealized Losses 17 425
Available-for-sale Securities $ 23,292 $ 22,864
[1] Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $212 million and $222 million at June 30, 2019 and December 31, 2018, respectively.