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Employee Benefit Plans (Reconciliation of Changes in Projected Benefit Obligation and Change in Plan Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, beginning balance $ 6,788    
Fair value of plan assets, end balance 5,400 $ 6,788  
Pension Plans | Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at end of year 4,517 5,370  
Projected benefit obligation at beginning of year 5,423 5,174  
Service cost 142 133 $ 122
Interest cost 156 139 160
Amendments (4)  
Actuarial (gains)/losses and changes in assumptions (833) (88)  
Benefits paid (345) (320)  
Projected benefit obligation from BBVA acquisition 389  
Projected benefit obligation at end of year 4,543 5,423 5,174
Fair value of plan assets, beginning balance 6,788 6,073  
Actual return on plan assets (1,043) 670  
Benefits paid (345) (320)  
Fair value of plan assets from BBVA acquisition   365  
Fair value of plan assets, end balance 5,400 6,788 6,073
Funded status 857 1,365  
Noncurrent asset 857 1,365  
Net amount recognized on the consolidated balance sheet 857 1,365  
Prior service cost (credit) 14 17  
Net actuarial loss (gain) 322 (186)  
Amount recognized in AOCI 336 (169)  
Pension Plans | Nonqualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at end of year 219 272  
Projected benefit obligation at beginning of year 280 263  
Service cost 3 4 3
Interest cost 7 6 8
Actuarial (gains)/losses and changes in assumptions (44) (4)  
Benefits paid (24) (21)  
Projected benefit obligation from BBVA acquisition 32  
Projected benefit obligation at end of year 222 280 263
Fair value of plan assets, beginning balance    
Employer contribution 24 21  
Benefits paid (24) (21)  
Fair value of plan assets, end balance  
Funded status (222) (280)  
Current liability (24) (25)  
Noncurrent liability (198) (255)  
Net amount recognized on the consolidated balance sheet (222) (280)  
Net actuarial loss (gain) 31 80  
Amount recognized in AOCI 31 80  
Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year 326 337  
Service cost 4 4 4
Interest cost 9 8 11
Actuarial (gains)/losses and changes in assumptions (57) (11)  
Participant contributions 2 3  
Federal Medicare subsidy on benefits paid 1 1  
Benefits paid (25) (25)  
Projected benefit obligation from BBVA acquisition 9  
Projected benefit obligation at end of year 260 326 337
Fair value of plan assets, beginning balance 263 262  
Actual return on plan assets (21) 2  
Employer contribution 22 20  
Participant contributions 2 3  
Federal Medicare subsidy on benefits paid 1 1  
Benefits paid (25) (25)  
Fair value of plan assets, end balance 242 263 $ 262
Funded status (18) (63)  
Current liability (3) (2)  
Noncurrent liability (25) (61)  
Net amount recognized on the consolidated balance sheet (18) (63)  
Prior service cost (credit) 1 1  
Net actuarial loss (gain) (32) (2)  
Amount recognized in AOCI $ (31) $ (1)