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Employee Benefit Plans Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Net periodic defined benefit credit $ (27) $ (91) $ (81)
Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 31 37 38
Interest cost 85 62 61
Expected return on plan assets (166) (201) (202)
Amortization of prior service (credit) cost (14) (14) (19)
Amortization of net loss 32 19 29
Total other components of net benefit credit or cost (63) (134) (131)
Net periodic defined benefit credit (32) (97) (93)
Actual return on plan assets $ 338 $ (777) $ 291
Actual rate of return on plan assets, percent 13.91% (23.02%) 8.92%
Weighted-average assumptions, discount rate, percent 5.60% 2.96% 2.71%
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 4.25% 4.00% 4.00%
Non-Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 2 $ 2 $ 2
Interest cost 9 6 7
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost (9) (9) (6)
Amortization of net loss 4 9 11
Total other components of net benefit credit or cost 4 6 12
Net periodic defined benefit credit 6 8 $ 14
Actual return on plan assets $ 0 $ 0  
Weighted-average assumptions, discount rate, percent 5.60% 2.96% 2.71%
Weighted-average assumptions, rate of compensation increase, percent 4.25% 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 (2) (3) (3)
Net periodic defined benefit credit (1) (2) (2)
Actual return on plan assets $ 1 $ (4) $ (1)
Actual rate of return on plan assets, percent 2.61% (8.24%) (2.25%)
Weighted-average assumptions, discount rate, percent 5.71% 2.79% 2.43%
Weighted-average assumptions, expected long-term return on plan assets, percent 5.00% 5.00% 5.00%
Health care cost trend rate assumed     6.00%
Rate to which the healthcare cost trend rate is assumed to decline (the ultimate trend rate), percent     4.50%
Defined Benefit Plan Year That Reaches Ultimate Trend Rate In Current Expense     2027