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Fair Value Measurements - Additional Information Relating To Asset-Backed Securities and Collateralized Debt Obligations (Detail)
$ in Millions
Sep. 30, 2020
USD ($)
AAA - A Rating [Member] | Level 3 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral $ 0 [1]
AAA - A Rating [Member] | Level 2 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 107 [1]
Collateralized debt obligations [Member] | AAA - A Rating [Member] | Level 3 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 0 [1]
Collateralized debt obligations [Member] | AAA - A Rating [Member] | Level 2 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 39 [1]
Collateralized debt obligations [Member] | BBB -B Rating [Member] | Level 3 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 0 [1]
Collateralized debt obligations [Member] | BBB -B Rating [Member] | Level 2 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 25 [1]
Student loans [Member] | AAA - A Rating [Member] | Level 3 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 0 [1]
Student loans [Member] | AAA - A Rating [Member] | Level 2 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 68 [1]
Other [Member] | BBB -B Rating [Member] | Level 3 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 100 [1]
Trading assets, excluding derivatives [Member] | Level 3 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 15 [1]
Trading assets, excluding derivatives [Member] | Level 2 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 132 [1]
Available-for-sale securities [Member] | Level 3 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 127
Estimate of fair value [Member] | AAA - A Rating [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 107 [1]
Estimate of fair value [Member] | Collateralized debt obligations [Member] | AAA - A Rating [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 39 [1]
Estimate of fair value [Member] | Collateralized debt obligations [Member] | BBB -B Rating [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 25 [1]
Estimate of fair value [Member] | Student loans [Member] | AAA - A Rating [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 68 [1]
Estimate of fair value [Member] | Trading assets, excluding derivatives [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 147 [1]
Alt [Member] | Home equity [Member] | AAA - A Rating [Member] | Level 3 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 27 [1]
Subprime [Member] | Residential mortgage - Subprime [Member] | CCC - Unrated [Member] | Level 3 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 15 [1]
Subprime [Member] | Residential mortgage - Subprime [Member] | CCC - Unrated [Member] | Level 2 [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 0 [1]
Subprime [Member] | Estimate of fair value [Member] | Residential mortgage - Subprime [Member] | CCC - Unrated [Member]  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral $ 15 [1]
[1] We utilize S&P as the primary source of credit ratings in the tables above. If S&P ratings are not available, ratings by Moody's and Fitch are used in that order. Ratings for CDOs represent the ratings associated with the underlying collateral.