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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, 2025	Dec. 31, 2024
Offsetting Assets [Line Items]
Estimated fair value of derivative assets presented in the consolidated balance sheets	$ 7,381	$ 8,370
Estimated fair value of derivative liabilities presented in the consolidated balance sheets	7,273	7,272
Net amount of derivative assets after application of master netting agreements and cash collateral	83	53
Net amount of derivative liabilities after application of master netting agreements and cash collateral	16	9
Over the Counter [Member]
Offsetting Assets [Line Items]
Gross estimated fair value of derivative assets	7,179	8,224
Gross estimated fair value of derivative liabilities	6,782	6,966
Gross estimated fair value of derivative assets	(3,205)	(3,633)
Gross estimated fair value of derivative liabilities	(3,205)	(3,633)
Cash collateral on derivative assets	(1,726)	(2,597)
Cash collateral on derivative liabilities	0	0
Securities collateral on derivative assets	(2,179)	(1,955)
Securities collateral on derivative liabilities	(3,562)	(3,325)
Cleared [Member]
Offsetting Assets [Line Items]
Gross estimated fair value of derivative assets	186	135
Gross estimated fair value of derivative liabilities	474	299
Gross estimated fair value of derivative assets	(4)	(5)
Gross estimated fair value of derivative liabilities	(4)	(5)
Cash collateral on derivative assets	(178)	(126)
Cash collateral on derivative liabilities	(467)	(289)
Securities collateral on derivative assets	0	0
Securities collateral on derivative liabilities	(3)	(4)
Exchange-traded
Offsetting Assets [Line Items]
Gross estimated fair value of derivative assets	16	11
Gross estimated fair value of derivative liabilities	17	7
Gross estimated fair value of derivative assets	(6)	(1)
Gross estimated fair value of derivative liabilities	(6)	(1)
Cash collateral on derivative assets	0	0
Cash collateral on derivative liabilities	(5)	(6)
Securities collateral on derivative assets	0	0
Securities collateral on derivative liabilities	$ (5)	$ 0

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