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Borrowings and Credit Agreements - Short-term Borrowings (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Short-term Debt [Line Items]    
Federal home loan bank advances maximum amount available $ 915,000,000  
Commercial Paper    
Short-term Debt [Line Items]    
Short-term debt 0 $ 0
Line of Credit | Back-Up Credit Facilities    
Short-term Debt [Line Items]    
Short-term debt $ 0 0
Commitment fee percentage 0.03%  
Line of Credit | Revolving Credit Facility, Expiring May 16, 2025    
Short-term Debt [Line Items]    
Maximum borrowing capacity $ 2,000,000,000  
Debt instrument term 5 years  
Line of Credit | Revolving Credit Facility, Expiring May 11, 2026    
Short-term Debt [Line Items]    
Maximum borrowing capacity $ 2,000,000,000  
Debt instrument term 5 years  
Line of Credit | Revolving Credit Facility, Expiring May 16, 2027    
Short-term Debt [Line Items]    
Maximum borrowing capacity $ 2,000,000,000  
Debt instrument term 5 years  
Federal Home Loan Bank Advances    
Short-term Debt [Line Items]    
Short-term debt $ 0 $ 0