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Derivative Financial Instruments - Information about Interest Rate Swap Agreements (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Derivative [Line Items]    
Notional Amount $ 26,977 $ 17,400
Average Maturity (in years) 2 years 2 months 12 days 1 year 7 months 6 days
Estimated Fair Value Gain (Loss) $ 10 $ (8)
Interest Payments On Variable Rate Commercial Real Estate Loans [Member] | Cash Flow Hedges [Member]    
Derivative [Line Items]    
Notional Amount $ 23,977 $ 15,900
Average Maturity (in years) 1 year 8 months 12 days 1 year 4 months 24 days
Weighted-Average Rate, Fixed 3.45% 1.91%
Weighted-Average Rate, Variable 5.36% 4.38%
Estimated Fair Value Gain (Loss) $ 11 $ (7)
Fixed Rate Long-Term Borrowings [Member] | Fair Value Hedges [Member]    
Derivative [Line Items]    
Notional Amount $ 3,000 $ 1,500
Average Maturity (in years) 5 years 9 months 18 days 3 years 3 months 18 days
Weighted-Average Rate, Fixed 3.45% 2.98%
Weighted-Average Rate, Variable 5.62% 4.52%
Estimated Fair Value Gain (Loss) $ (1) $ (1)