Credit Quality And Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loan interest receivable	$ 307		$ 307		$ 261
Commitments to lend additional funds to TDR borrowers	0		0		$ 0
Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructuring, other-than-insignificant payment delays	5		5
International
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructuring, other-than-insignificant payment delays	$ 1		$ 1
Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Minimum period loan terms were extended	90 days	90 days	90 days	90 days
Subsequent default during period	$ 0	$ 0	$ 0	$ 0
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Minimum period loan terms were extended	90 days	90 days	90 days	90 days
Subsequent default during period	$ 0	$ 0	$ 0	$ 0