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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Total long-term debt $ 19,554 $ 19,307
Finance lease liabilities 5 6
Senior Medium-Term Notes Due Through 2033    
Debt Instrument [Line Items]    
Senior medium-term notes $ 3,870 $ 3,789
Long-term debt weighted average interest rate 2.31% 2.3134%
Other subordinated notes    
Debt Instrument [Line Items]    
Long-term debt weighted average interest rate 7.14% 6.16%
Senior Medium-Term Notes Due Through 2039    
Debt Instrument [Line Items]    
Senior medium-term notes $ 5,519 $ 6,411
Long-term debt weighted average interest rate 4.88% 5.96%
4.39% Senior Remarketable Notes Due 2027    
Debt Instrument [Line Items]    
Long-term debt weighted average interest rate 4.39% 4.39%
Secured Borrowing Due Through 2032    
Debt Instrument [Line Items]    
Secured borrowing due through 2032 $ 11 $ 14
Finance lease liabilities 5  
Federal Home Loan Bank Advances Due Through 2038    
Debt Instrument [Line Items]    
Federal home loan bank advances due through 2038 $ 7,586 $ 6,594
Long-term debt weighted average interest rate 5.76% 4.48%
Investment Fund Financing due through 2055    
Debt Instrument [Line Items]    
Investment fund financing due through 2052 $ 24 $ 10
Obligations Under Capital Lease Due Through 2032    
Debt Instrument [Line Items]    
Finance lease liabilities 5  
Real Estate Loans and securities pledged $ 7,600 6,600
Subordinated Notes | 2.075% Subordinated notes due 2028    
Debt Instrument [Line Items]    
Debt instrument interest rate 2.075%  
Subordinated long-term notes $ 162 162
Subordinated Notes | 6.875 Percent Subordinated Notes Due 2029    
Debt Instrument [Line Items]    
Debt instrument interest rate 6.875%  
Subordinated long-term notes $ 91 99
Subordinated Notes | 7.75% Subordinated Notes Due 2029    
Debt Instrument [Line Items]    
Debt instrument interest rate 7.75%  
Subordinated long-term notes $ 117 112
Subordinated Notes | Other subordinated notes    
Debt Instrument [Line Items]    
Subordinated long-term notes $ 77 77
Subordinated Notes | 4.39% Senior Remarketable Notes Due 2027    
Debt Instrument [Line Items]    
Debt instrument interest rate 4.39%  
Subordinated long-term notes $ 214 191
Subordinated Notes | 3.40% Subordinated Notes Due 2026    
Debt Instrument [Line Items]    
Debt instrument interest rate 3.40%  
Subordinated long-term notes $ 569 555
Subordinated Notes | 6.95% Subordinated Notes Due 2028    
Debt Instrument [Line Items]    
Debt instrument interest rate 6.95%  
Subordinated long-term notes $ 286 281
Subordinated Notes | 3.90% Subordinated Notes Due 2029    
Debt Instrument [Line Items]    
Debt instrument interest rate 3.90%  
Subordinated long-term notes $ 333 327
Subordinated Notes | 4.90% Subordinated Notes Due 2032    
Debt Instrument [Line Items]    
Debt instrument interest rate 4.90%  
Subordinated long-term notes $ 695 685
Key    
Debt Instrument [Line Items]    
Total long-term debt 4,317 4,239
Subsidiaries    
Debt Instrument [Line Items]    
Total long-term debt $ 15,237 $ 15,068