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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 ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair value of plan assets at January 1 $ 2,499,000,000    
Fair value of plan assets at December 31 2,665,000,000 $ 2,499,000,000  
Benefit plans, Actuarial gain (loss) arising during the period 96,000,000 (415,000,000) $ 159,000,000
Qualified Plan      
Fair value of plan assets at January 1 2,508,000,000 3,462,000,000  
Actual return on plan assets 338,000,000 (777,000,000) 291,000,000
Benefits paid (165,000,000) (177,000,000)  
Fair value of plan assets at December 31 2,681,000,000 2,508,000,000 3,462,000,000
Projected benefit obligation at January 1 1,611,000,000 2,214,000,000  
Service cost 31,000,000 37,000,000 38,000,000
Interest cost 85,000,000 62,000,000 61,000,000
Benefit plans, Actuarial gain (loss) arising during the period 67,000,000 (525,000,000)  
Projected benefit obligation at December 31 1,629,000,000 1,611,000,000 2,214,000,000
Accumulated benefit obligation 1,611,000,000 1,598,000,000  
Funded Status at December 31 [1],[2] $ 1,052,000,000 $ 897,000,000  
Weighted-average assumptions, discount rate, percent 5.33% 5.60%  
Weighted-average assumptions, rate of compensation increase, percent 4.50% 4.25%  
Net actuarial loss $ (501,000,000) $ (638,000,000)  
Amortization of prior service credit 19,000,000 33,000,000  
Balance at December 31 $ (482,000,000) $ (605,000,000)  
Qualified Plan | Minimum      
Weighted-average assumptions, interest credit rating 466.00% 399.00%  
Qualified Plan | Maximum      
Weighted-average assumptions, interest credit rating 525.00% 525.00%  
Non-Qualified Plan      
Fair value of plan assets at January 1 $ 0 $ 0  
Actual return on plan assets 0 0  
Benefits paid (15,000,000) (15,000,000)  
Fair value of plan assets at December 31 0 0 0
Projected benefit obligation at January 1 163,000,000 207,000,000  
Service cost 2,000,000 2,000,000 2,000,000
Interest cost 9,000,000 6,000,000 7,000,000
Benefit plans, Actuarial gain (loss) arising during the period 10,000,000 (37,000,000)  
Projected benefit obligation at December 31 169,000,000 163,000,000 207,000,000
Accumulated benefit obligation 166,000,000 161,000,000  
Funded Status at December 31 [1],[2] $ (169,000,000) $ (163,000,000)  
Weighted-average assumptions, discount rate, percent 5.33% 5.60%  
Weighted-average assumptions, rate of compensation increase, percent 4.50% 4.25%  
Net actuarial loss $ (52,000,000) $ (46,000,000)  
Amortization of prior service credit 29,000,000 38,000,000  
Balance at December 31 $ (23,000,000) $ (8,000,000)  
Non-Qualified Plan | Minimum      
Weighted-average assumptions, interest credit rating 466.00% 399.00%  
Non-Qualified Plan | Maximum      
Weighted-average assumptions, interest credit rating 525.00% 525.00%  
Postretirement Benefit Plan      
Fair value of plan assets at January 1 $ 46,000,000 $ 53,000,000  
Actual return on plan assets 1,000,000 (4,000,000) (1,000,000)
Benefits paid (2,000,000) (3,000,000)  
Fair value of plan assets at December 31 45,000,000 46,000,000 53,000,000
Projected benefit obligation at January 1 21,000,000 31,000,000  
Service cost 0 0  
Interest cost 1,000,000 1,000,000 1,000,000
Benefit plans, Actuarial gain (loss) arising during the period (3,000,000) (8,000,000)  
Projected benefit obligation at December 31 17,000,000 21,000,000 $ 31,000,000
Accumulated benefit obligation 17,000,000 21,000,000  
Funded Status at December 31 [1],[2] $ 28,000,000 $ 25,000,000  
Weighted-average assumptions, discount rate, percent 5.43% 5.71%  
Net actuarial loss $ (9,000,000) $ (10,000,000)  
Amortization of prior service credit 2,000,000 2,000,000  
Balance at December 31 $ (7,000,000) $ (8,000,000)  
[1] Based on projected benefit obligation for defined benefit pension plans and accumulated benefit obligation for postretirement benefit plan.
[2] 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.
n/a - not applicable