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Borrowings and Credit Agreements - Short-term Borrowings (Details) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 02, 2023 | May 02, 2023 | May 01, 2023 | Feb. 21, 2023 | Feb. 28, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 200,000,000 | $ 0
Proceeds from debt | $ 4,900,000,000 |  | $ 5,000,000,000 | $ 6,000,000,000 | $ 6,000,000,000 |  |
Federal Home Loan Bank advances maximum amount available |  |  |  |  |  | 1,000,000,000 |
Commercial Paper |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 200,000,000 | 0
Short-term debt, weighted average interest rate |  |  |  |  |  | 4.31% |
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 |  |  |  |  |  | $ 2,500,000,000 |
Debt instrument term |  |  |  |  |  | 5 years |
Line of Credit | Revolving Credit Facility, Expiring May 11, 2026 |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 2,500,000,000 |
Debt instrument term |  |  |  |  |  | 5 years |
Line of Credit | Revolving Credit Facility, Expiring May 16, 2027 |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 2,500,000,000 |
Debt instrument term |  |  |  |  |  | 5 years |
Loans Payable | 364-day Term Loan Agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt instrument term |  |  | 364 days |  |  |  |
Debt face amount |  |  | $ 5,000,000,000 |  |  |  |
Proceeds from debt |  | $ 5,000,000,000 |  |  |  |  |
Debt interest rate |  | 6.20% |  |  |  |  |
Federal Home Loan Bank Advances |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 0 | $ 0

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