Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis) (Details) - Nonrecurring - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Liabilities recorded at fair value	$ 0	$ 0
Level 3
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Total Loans	44	66
Loans Held for Sale	231
Other Real Estate	5	9
Total assets at fair value	280	75
Commercial | Domestic loans | Level 3
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Total Loans	12	53
Commercial | International | Level 3
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Total Loans	16
Commercial | Commercial mortgage loans | Domestic loans | Level 3
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Total Loans	$ 16	11
Commercial | Construction | Domestic loans | Level 3
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Total Loans		$ 2