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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Offsetting Assets [Line Items] |  |
Estimated fair value of derivative assets presented in the consolidated balance sheets | $ 8,319 | $ 8,918
Estimated fair value of derivative liabilities presented in the consolidated balance sheets | 6,304 | 6,307
Net amount of derivative assets after application of master netting agreements and cash collateral | 106 | 183
Net amount of derivative liabilities after application of master netting agreements and cash collateral | 8 | 19
Over the Counter [Member] |  |
Offsetting Assets [Line Items] |  |
Gross estimated fair value of derivative assets | 8,111 | 8,749
Gross estimated fair value of derivative liabilities | 6,036 | 6,014
Gross estimated fair value of derivative assets | (3,035) | (3,568)
Gross estimated fair value of derivative liabilities | (3,035) | (3,568)
Cash collateral on derivative assets | (2,676) | (3,448)
Cash collateral on derivative liabilities | 0 | 0
Securities collateral on derivative assets | (2,313) | (1,563)
Securities collateral on derivative liabilities | (2,993) | (2,427)
Cleared [Member] |  |
Offsetting Assets [Line Items] |  |
Gross estimated fair value of derivative assets | 191 | 158
Gross estimated fair value of derivative liabilities | 260 | 277
Gross estimated fair value of derivative assets | (5) | (5)
Gross estimated fair value of derivative liabilities | (5) | (5)
Cash collateral on derivative assets | (181) | (150)
Cash collateral on derivative liabilities | (237) | (239)
Securities collateral on derivative assets | 0 | 0
Securities collateral on derivative liabilities | (18) | (33)
Exchange-traded |  |
Offsetting Assets [Line Items] |  |
Gross estimated fair value of derivative assets | 17 | 11
Gross estimated fair value of derivative liabilities | 8 | 16
Gross estimated fair value of derivative assets | (3) | (1)
Gross estimated fair value of derivative liabilities | (3) | (1)
Cash collateral on derivative assets | 0 | 0
Cash collateral on derivative liabilities | (4) | (5)
Securities collateral on derivative assets | 0 | 0
Securities collateral on derivative liabilities | $ (1) | $ (10)

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