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Securities Available for Sale (Addition Information) (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities [1],[2] $ 30,984 $ 30,947 [3]
Federal Home Loan Bank (FHLB) of Atlanta stock (par value) [4],[5] 142 15
Federal Reserve Bank Stock [4],[5] 403 403
Mutual Fund Investments [4],[5] 65 49
Fair Value, Inputs, Level 3 [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 0 72
Fair Value, Measurements, Recurring [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 30,984 [6] 30,947 [7]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities $ 0 [6] $ 72 [7]
[1] Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets. Reclassifications have been made to previously reported amounts for comparability.
[2] Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $164 million and $223 million at September 30, 2018 and December 31, 2017, respectively.
[3] Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets on the Consolidated Balance Sheets. Reclassifications have been made to previously reported amounts for comparability. See Note 9, "Other Assets," for additional information.
[4] Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets on the Consolidated Balance Sheets. Reclassifications have been made to previously reported amounts for comparability.
[5] Equity securities held for trading purposes are classified in Trading assets and derivative instruments or Trading liabilities and derivative instruments on the Company's Consolidated Balance Sheets.
[6] Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets on the Consolidated Balance Sheets. Reclassifications have been made to previously reported amounts for comparability. See Note 9, "Other Assets," for additional information.
[7] Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets on the Consolidated Balance Sheets. Reclassifications have been made to previously reported amounts for comparability. See Note 9, "Other Assets," for additional information.