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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Offsetting Assets [Line Items] |  |
Estimated fair value of derivative assets presented in the consolidated balance sheets | $ 11,723 | $ 10,596
Estimated fair value of derivative liabilities presented in the consolidated balance sheets | 6,840 | 3,829
Net amount of derivative assets after application of master netting agreements and cash collateral | 220 | 124
Net amount of derivative liabilities after application of master netting agreements and cash collateral | 58 | 121
Over the Counter [Member] |  |
Offsetting Assets [Line Items] |  |
Gross estimated fair value of derivative assets | 11,608 | 10,132
Gross estimated fair value of derivative liabilities | 6,665 | 3,798
Gross estimated fair value of derivative assets | (4,166) | (2,204)
Gross estimated fair value of derivative liabilities | (4,166) | (2,204)
Cash collateral on derivative assets | (6,454) | (6,948)
Cash collateral on derivative liabilities | 0 | 0
Securities collateral on derivative assets | (852) | (891)
Securities collateral on derivative liabilities | (2,442) | (1,473)
Cleared [Member] |  |
Offsetting Assets [Line Items] |  |
Gross estimated fair value of derivative assets | 73 | 448
Gross estimated fair value of derivative liabilities | 160 | 24
Gross estimated fair value of derivative assets | (28) | (6)
Gross estimated fair value of derivative liabilities | (28) | (6)
Cash collateral on derivative assets | 0 | (421)
Cash collateral on derivative liabilities | (112) | (13)
Securities collateral on derivative assets | 0 | 0
Securities collateral on derivative liabilities | (19) | (5)
Exchange-traded |  |
Offsetting Assets [Line Items] |  |
Gross estimated fair value of derivative assets | 42 | 16
Gross estimated fair value of derivative liabilities | 15 | 7
Gross estimated fair value of derivative assets | (3) | (2)
Gross estimated fair value of derivative liabilities | (3) | (2)
Cash collateral on derivative assets | 0 | 0
Cash collateral on derivative liabilities | (12) | (3)
Securities collateral on derivative assets | 0 | 0
Securities collateral on derivative liabilities | $ 0 | $ (2)

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