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Employee Benefit Plans (Reconciliations of Plan assets and the Projected Benefit Obligation, the Weighted-Average Assumptions Used to Determine Year-End Benefit Obligations, and the Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair value of plan assets at January 1 $ 3,454    
Fair value of plan assets at December 31 2,499 $ 3,454  
Actuarial (loss) gain arising during the period (415) 159 $ 128
Qualified Plan      
Fair value of plan assets at January 1 3,462 3,350  
Actual return on plan assets (777) 291 537
Plan participants' contributions 0 0  
Benefits paid (177) (179)  
Fair value of plan assets at December 31 2,508 3,462 3,350
Projected benefit obligation at January 1 2,214 2,327  
Service cost [1] 37 38 32
Interest cost 62 61 70
Actuarial (loss) gain arising during the period (525) (69)  
Plan participants' contributions 0 0  
Plan amendments [2] 0 36  
Projected benefit obligation at December 31 1,611 2,214 2,327
Accumulated benefit obligation 1,598 2,199  
Funded Status at December 31 [3],[4] $ 897 $ 1,248  
Weighted-average assumptions, discount rate, percent 5.60% 2.96%  
Weighted-average assumptions, rate of compensation increase, percent 4.25% 4.00%  
Net actuarial loss $ (638) $ (205)  
Amortization of prior service credit 33 48  
Balance at December 31 $ (605) $ (157)  
Qualified Plan | Minimum      
Weighted-average assumptions, interest credit rating 399.00% 379.00%  
Qualified Plan | Maximum      
Weighted-average assumptions, interest credit rating 525.00% 500.00%  
Non-Qualified Plan      
Fair value of plan assets at January 1 $ 0 $ 0  
Actual return on plan assets 0 0  
Plan participants' contributions 0 0  
Benefits paid (15) (15)  
Fair value of plan assets at December 31 0 0 0
Projected benefit obligation at January 1 207 252  
Service cost [1] 2 2 1
Interest cost 6 7 8
Actuarial (loss) gain arising during the period (37) (3)  
Plan participants' contributions 0 0  
Plan amendments [2] 0 (36)  
Projected benefit obligation at December 31 163 207 252
Accumulated benefit obligation 161 204  
Funded Status at December 31 [3],[4] $ (163) $ (207)  
Weighted-average assumptions, discount rate, percent 5.60% 2.96%  
Weighted-average assumptions, rate of compensation increase, percent 4.25% 4.00%  
Net actuarial loss $ (46) $ (92)  
Amortization of prior service credit 38 47  
Balance at December 31 $ (8) $ (45)  
Non-Qualified Plan | Minimum      
Weighted-average assumptions, interest credit rating 399.00% 379.00%  
Non-Qualified Plan | Maximum      
Weighted-average assumptions, interest credit rating 525.00% 500.00%  
Postretirement Benefit Plan      
Fair value of plan assets at January 1 $ 53 $ 57  
Actual return on plan assets (4) (1) 3
Plan participants' contributions 0 1  
Benefits paid (3) (4)  
Fair value of plan assets at December 31 46 53 57
Projected benefit obligation at January 1 31 35  
Service cost 0 0  
Interest cost 1 1 1
Actuarial (loss) gain arising during the period (8) (1)  
Plan participants' contributions 0 1  
Plan amendments [2] 0 (1)  
Projected benefit obligation at December 31 21 31 $ 35
Accumulated benefit obligation 21 31  
Funded Status at December 31 [3],[4] $ 25 $ 22  
Weighted-average assumptions, discount rate, percent 5.71% 2.79%  
Net actuarial loss $ (10) $ (11)  
Amortization of prior service credit 2 2  
Balance at December 31 $ (8) $ (9)  
[1] Included in salaries and benefits expense on the Consolidated Statements of Income.
[2] The qualified defined benefit pension plan was amended in 2021 to include a flat dollar benefit for specified participants that would otherwise have been payable from the non-qualified defined benefit pension plan, resulting in a shift in projected benefit obligation from the non-qualified plan to the qualified plan.
[3] Based on projected benefit obligation for defined benefit pension plans and accumulated benefit obligation for postretirement benefit plan.
[4] The Corporation recognizes the overfunded and underfunded status of the plans in accrued income and other assets and accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheets.