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Fair Value Measurements - Quantitative Information about Recurring Fair Value Measurement of Assets and Liabilities Classified as Level 3 (Detail)
$ in Millions
Mar. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value [1] $ 25,550 $ 25,696
Long-term debt [1] (19,439) (18,661)
Level 3    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Commercial loans held-for-sale 25 32
Mortgage servicing rights 19 19
Domestic deposits (331) (293)
Long-term debt 0 0
Structured notes | Level 3    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Long-term debt (1,959) (1,919)
Asset-backed securities | Level 3    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value 102 104
Interest rate contracts | Level 3    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivative assets (liability (3) (4)
Foreign exchange contracts | Level 3    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivative assets (liability 0 0
Equity contracts | Level 3    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivative assets (liability 67 21
Credit contracts | Level 3    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivative assets (liability   1
Other Contracts | Level 3    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivative assets (liability $ (30) $ (35)
Probability to fund for rate lock commitments | Interest rate contracts | Recurring | Minimum | Market comparable adjusted for probability to fund and, where applicable, option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 0.51 0.71
Probability to fund for rate lock commitments | Interest rate contracts | Recurring | Maximum | Market comparable adjusted for probability to fund and, where applicable, option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 1 0.92
Probability to fund for rate lock commitments | Interest rate contracts | Recurring | Weighted Average | Market comparable adjusted for probability to fund and, where applicable, option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 0.84 0.84
Interest rate yield curve | Interest rate contracts | Recurring | Market comparable adjusted for probability to fund and, where applicable, option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 0.09 0.09
Cross-currency basis | Foreign exchange contracts | Recurring | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives (0.0018) 0.0008
Equity / Equity Index volatility | Recurring | Minimum | Option adjusted discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Domestic deposits 0.06 0.07
Equity / Equity Index volatility | Recurring | Minimum | Option adjusted discounted cash flows | Structured notes    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Long-term debt 0.07 0.07
Equity / Equity Index volatility | Recurring | Maximum | Option adjusted discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Domestic deposits 0.29 0.29
Equity / Equity Index volatility | Recurring | Maximum | Option adjusted discounted cash flows | Structured notes    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Long-term debt 0.95 0.95
Equity / Equity Index volatility | Recurring | Weighted Average | Option adjusted discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Domestic deposits 0.13 0.13
Equity / Equity Index volatility | Recurring | Weighted Average | Option adjusted discounted cash flows | Structured notes    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Long-term debt 0.23 0.22
Equity / Equity Index volatility | Equity contracts | Recurring | Minimum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 0.06 0.06
Equity / Equity Index volatility | Equity contracts | Recurring | Maximum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 1.30 1.11
Equity / Equity Index volatility | Equity contracts | Recurring | Weighted Average | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 0.40 0.41
Equity / Equity and Equity / Index correlation | Recurring | Minimum | Option adjusted discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Domestic deposits 0.43 0.51
Equity / Equity and Equity / Index correlation | Recurring | Minimum | Option adjusted discounted cash flows | Structured notes    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Long-term debt 0.35 0.45
Equity / Equity and Equity / Index correlation | Recurring | Maximum | Option adjusted discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Domestic deposits 0.88 0.93
Equity / Equity and Equity / Index correlation | Recurring | Maximum | Option adjusted discounted cash flows | Structured notes    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Long-term debt 0.97 0.97
Equity / Equity and Equity / Index correlation | Recurring | Weighted Average | Option adjusted discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Domestic deposits 0.66 0.71
Equity / Equity and Equity / Index correlation | Recurring | Weighted Average | Option adjusted discounted cash flows | Structured notes    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Long-term debt 0.84 0.84
Equity / Equity and Equity / Index correlation | Equity contracts | Recurring | Minimum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 0.35 0.45
Equity / Equity and Equity / Index correlation | Equity contracts | Recurring | Maximum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 0.97 0.97
Equity / Equity and Equity / Index correlation | Equity contracts | Recurring | Weighted Average | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 0.82 0.84
Equity forward price | Equity contracts | Recurring | Minimum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives | $ / shares 42  
Equity forward price | Equity contracts | Recurring | Maximum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives | $ / shares 6,897  
Equity forward price | Equity contracts | Recurring | Weighted Average | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives | $ / shares 1,798  
Equity forward price | Equity contracts | Recurring | Minimum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives   41
Equity forward price | Equity contracts | Recurring | Maximum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives   6,245
Equity forward price | Equity contracts | Recurring | Weighted Average | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives   643
Credit default swap spreads | Recurring | Option adjusted discounted cash flows | Structured notes    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Long-term debt 0.0795 0.0948
Credit default swap spreads | Credit contracts | Recurring | Minimum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives   0.0059
Credit default swap spreads | Credit contracts | Recurring | Maximum | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives   0.1558
Credit default swap spreads | Credit contracts | Recurring | Weighted Average | Option pricing model    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives   0.0160
Conversion rate | Other Contracts | Recurring | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 1.6 1.6
Expected duration | Other Contracts | Recurring | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Derivatives 0.8 1
Market assumptions related to yields for comparable instruments | Recurring | Minimum | Market comparables and internal assumptions    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Loans Held-for-sale, Measurement Input 0.48 0.78
Market assumptions related to yields for comparable instruments | Recurring | Maximum | Market comparables and internal assumptions    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Loans Held-for-sale, Measurement Input 1.01 1
Market assumptions related to yields for comparable instruments | Recurring | Weighted Average | Market comparables and internal assumptions    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Loans Held-for-sale, Measurement Input 0.91 0.90
Market assumptions related to yields for comparable instruments | Asset-backed securities | Recurring | Minimum | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Available for sale securities 0.02 0.02
Market assumptions related to yields for comparable instruments | Asset-backed securities | Recurring | Maximum | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Available for sale securities 0.03 0.03
Market assumptions related to yields for comparable instruments | Asset-backed securities | Recurring | Weighted Average | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Available for sale securities 0.02 0.02
Constant prepayment rates | Recurring | Minimum | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Mortgage servicing rights 0.06 0.06
Constant prepayment rates | Recurring | Maximum | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Mortgage servicing rights 0.16 0.17
Constant prepayment rates | Recurring | Weighted Average | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Mortgage servicing rights 0.06 0.06
Discount rate | Recurring | Minimum | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Mortgage servicing rights 0.10 0.10
Discount rate | Recurring | Maximum | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Mortgage servicing rights 0.14 0.14
Discount rate | Recurring | Weighted Average | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Mortgage servicing rights 0.10 0.10
Estimated annualized costs to service | Recurring | Minimum | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Mortgage servicing rights 72 72
Estimated annualized costs to service | Recurring | Maximum | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Mortgage servicing rights 75 77
Estimated annualized costs to service | Recurring | Weighted Average | Discounted cash flows    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Mortgage servicing rights 74 74
[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at March 31, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information.
March 31, 2024December 31, 2023
(in millions)
Assets
Other assets$21 $23 
Total assets$21 $23 
Liabilities
Interest, taxes and other liabilities$28 $17 
Total liabilities$28 $17