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Benefit Plans (Schedule of Components of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 64 $ 68 $ 74
Interest cost 206 184 251
Expected return on plan assets (493) (522) (502)
Amortization:      
Net loss 96 131 134
Prior service cost (credit) 6 5 5
Settlement 0 0 10
Net periodic benefit cost (income) (121) (134) (28)
Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 23 20 16
Interest cost 41 38 59
Expected return on plan assets (13) (14) (14)
Amortization:      
Net loss 18 22 10
Prior service cost (credit) (45) (46) (30)
Settlement 0 0 0
Net periodic benefit cost (income) $ 24 $ 20 $ 41