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Investment Securities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Schedule of Investments [Line Items]
Net unsettled investment purchases	$ 151	$ 151	$ 197
Investment securities, allowance for credit loss	93	93		$ 92
Pretax loss included in AOCI from derivatives	(285)	(285)	(301)
Securities available for sale	3,800
Loss on sale of available for sale securities	497	501	$ 2
Federal National Mortgage Association Certificates and Obligations (FNMA)
Schedule of Investments [Line Items]
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity	35,900	35,900
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity	32,400	32,400
Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans
Schedule of Investments [Line Items]
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity	31,400	31,400
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity	$ 28,700	$ 28,700

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