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Securities Available for Sale (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 31,828 $ 31,910
Unrealized Gains 245 142
Unrealized Losses 220 610
Available-for-sale Securities [1] 31,853 31,442
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4,279 4,277
Unrealized Gains 4 0
Unrealized Losses 24 66
Available-for-sale Securities 4,259 4,211
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 143 221
Unrealized Gains 1 2
Unrealized Losses 2 2
Available-for-sale Securities 142 221
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 594 606
Unrealized Gains 6 4
Unrealized Losses 7 21
Available-for-sale Securities 593 589
Other Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 13 14
Unrealized Gains 0 0
Unrealized Losses 0 0
Available-for-sale Securities 13 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 2,641 2,688
Unrealized Gains 20 8
Unrealized Losses 37 69
Available-for-sale Securities 2,624 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 7 0
Unrealized Losses 4 27
Available-for-sale Securities 1,012 916
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 23,149 23,161
Unrealized Gains 207 128
Unrealized Losses 146 425
Available-for-sale Securities $ 23,210 $ 22,864
[1] Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $210 million and $222 million at March 31, 2019 and December 31, 2018, respectively.