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Employee Benefit Plans Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Net periodic defined benefit (credit) cost $ (91) $ (81) $ (55)
Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost [1] 37 38 32
Interest cost 62 61 70
Expected return on plan assets (201) (202) (185)
Amortization of prior service credit (14) (19) (19)
Amortization of actuarial net loss 19 29 38
Total other components of net benefit credit or cost [2] (134) (131) (96)
Net periodic defined benefit (credit) cost (97) (93) (64)
Actual return on plan assets $ (777) $ 291 $ 537
Actual rate of return on plan assets, percent (23.02%) 8.92% 18.72%
Weighted-average assumptions, discount rate, percent 2.96% 2.71% 3.43%
Weighted-average assumptions, expected long-term return on plan assets, percent 6.50% 6.50% 6.50%
Weighted-average assumptions, rate of compensation increase, percent 4.00% 4.00% 4.00%
Non-Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost [1] $ 2 $ 2 $ 1
Interest cost 6 7 8
Expected return on plan assets 0 0 0
Amortization of prior service credit (9) (6) (8)
Amortization of actuarial net loss 9 11 9
Total other components of net benefit credit or cost [2] 6 12 9
Net periodic defined benefit (credit) cost 8 14 $ 10
Actual return on plan assets $ 0 $ 0  
Weighted-average assumptions, discount rate, percent 2.96% 2.71% 3.43%
Weighted-average assumptions, rate of compensation increase, percent 4.00% 4.00% 4.00%
Postretirement Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0 $ 0  
Interest cost 1 1 $ 1
Expected return on plan assets (3) (3) (2)
Net periodic defined benefit (credit) cost (2) (2) (1)
Actual return on plan assets $ (4) $ (1) $ 3
Actual rate of return on plan assets, percent (8.24%) (2.25%) 6.00%
Weighted-average assumptions, discount rate, percent 2.79% 2.43% 3.26%
Weighted-average assumptions, expected long-term return on plan assets, percent 5.00% 5.00% 5.00%
Health care cost trend rate assumed [3]   6.00% 6.25%
Rate to which the healthcare cost trend rate is assumed to decline (the ultimate trend rate), percent [3]   4.50% 4.50%
Defined Benefit Plan Year That Reaches Ultimate Trend Rate In Current Expense [3]   2027 2027
[1] Included in salaries and benefits expense on the Consolidated Statements of Income.
[2] Included in other noninterest expenses on the Consolidated Statements of Income.
[3] Beginning January 1, 2022, the healthcare cost trend assumption is no longer a relevant assumption due to the change from a self-insured plan to the Medicare and pre-65 individual marketplace with a funded Health Reimbursement Arrangement account.