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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Offsetting Assets [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Excluding Accruals | $ 8,370 | $ 8,918
Derivative Liability, Fair Value, Gross Liability Excluding Accruals | 7,272 | 6,307
Net amount of derivative assets after application of master netting agreements and cash collateral | 53 | 183
Net amount of derivative liabilities after application of master netting agreements and cash collateral | 9 | 19
Over the Counter [Member] |  |
Offsetting Assets [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Excluding Accruals | 8,224 | 8,749
Derivative Liability, Fair Value, Gross Liability Excluding Accruals | 6,966 | 6,014
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset | (3,633) | (3,568)
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset | (3,633) | (3,568)
Cash collateral on derivative assets | (2,597) | (3,448)
Cash collateral on derivative liabilities | 0 | 0
Securities collateral on derivative assets | (1,955) | (1,563)
Securities collateral on derivative liabilities | (3,325) | (2,427)
Cleared [Member] |  |
Offsetting Assets [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Excluding Accruals | 135 | 158
Derivative Liability, Fair Value, Gross Liability Excluding Accruals | 299 | 277
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset | (5) | (5)
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset | (5) | (5)
Cash collateral on derivative assets | (126) | (150)
Cash collateral on derivative liabilities | (289) | (239)
Securities collateral on derivative assets | 0 | 0
Securities collateral on derivative liabilities | (4) | (33)
Exchange Traded [Member] |  |
Offsetting Assets [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset Excluding Accruals | 11 | 11
Derivative Liability, Fair Value, Gross Liability Excluding Accruals | 7 | 16
Gross estimated fair value of derivative assets | 1 | 1
Gross estimated fair value of derivative liabilities | 1 | 1
Cash collateral on derivative assets | 0 | 0
Cash collateral on derivative liabilities | (6) | (5)
Securities collateral on derivative assets | 0 | 0
Securities collateral on derivative liabilities | $ 0 | $ (10)

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