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Short-Term Borrowings - Components of Short-Term Borrowings (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Short-term Debt [Line Items]      
Balance at year end, securities sold under repurchase agreements $ 0 $ 0  
FEDERAL FUNDS PURCHASED      
Short-term Debt [Line Items]      
Balance at year end, federal funds purchase 0 4,006 $ 0
Average during the year 1,098 1,490 0
Maximum month-end balance $ 3,020 $ 5,872 $ 0
Weighted-average rate during the year 4.83% 2.04% 0.00%
Weighted-average rate at year end 0.00% 4.18% 0.00%
SECURITIES SOLD UNDER REPURCHASE AGREEMENTS      
Short-term Debt [Line Items]      
Average during the year $ 549 $ 617 $ 239
Maximum month-end balance $ 1,954 $ 1,090 $ 281
Weighted-average rate during the year 4.77% 1.66% 0.02%
Weighted-average rate at year end 1.63% 3.74% 0.01%
Balance at year end, securities sold under repurchase agreements $ 38 $ 71 $ 173
OTHER SHORT-TERM BORROWINGS      
Short-term Debt [Line Items]      
Average during the year 5,890 2,963 770
Maximum month-end balance $ 1,061 $ 11,372 $ 897
Weighted-average rate during the year 5.24% 1.82% 1.08%
Weighted-average rate at year end 5.58% 0.50% 1.97%
Balance at year end, other short-term borrowings $ 3,053 $ 5,386 $ 588