Basis of Presentation and Significant Accounting Policies, Allowance for Credit Losses - Loans (Details) $ in Billions	9 Months Ended
	Sep. 30, 2024 USD ($) LoanSegment Bank
Allowance for Credit Losses - Loans [Abstract]
Number of loan segments | LoanSegment	17
Number of banks included in peer group segmentation | Bank	200
Minimum [Member]
Allowance for Credit Losses - Loans [Abstract]
Loan portfolio segments period	6 months
Assets of peer group of banks	$ 3
Maximum [Member]
Allowance for Credit Losses - Loans [Abstract]
Loan portfolio segments period	3 years 6 months
Assets of peer group of banks	$ 10