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Employee Benefit Plans (Narrative) (Details)
shares in Millions, $ in Millions
12 Months Ended
Apr. 01, 2021
USD ($)
retirees
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Number of retirees | retirees 6,000      
Pension settlement   $ 0 $ (83) $ 0
Percentage of non-matching employer's contribution to eligible participants (as a percent)   1.00%    
Employer's Common stock held under 401 (k) plan (in shares) | shares   5.9    
Market value of employer's Common stock held under 401 (k) plan   $ 550    
Cash dividend received on employer's Common stock held under 401 (k) plan   10    
Increase (Decrease) in Obligation, Pension Benefits $ 700      
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Payment for Settlement   1 715  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement   1 715  
Pension settlement   0 (83) 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment   2 0 0
Accumulated other comprehensive income, unrecognized prior service cost (credit)   (75)    
Accumulated other comprehensive income, unrecognized actuarial losses   226    
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit obligation   1,300 1,700  
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation   1,200 1,700  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation   1,300 1,600  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets   900 1,200  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation   1,200 1,600  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets   800 1,200  
Accumulated benefit obligation   1,600 2,100  
Contributions and expected future benefit payments   $ 25    
Pension Benefits [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Amortization period of actuarial gains and losses   2 years    
Pension Benefits [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Amortization period of actuarial gains and losses   28 years    
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement   $ 0 0  
Pension settlement   0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment   0 $ 0 $ 0
Accumulated other comprehensive income, unrecognized prior service cost (credit)   1    
Accumulated other comprehensive income, unrecognized actuarial losses   $ 16    
Annual rate of increase in per capita cost of covered health care benefits assumed for transition period (as a percent)   6.90%    
Annual rate for per capita cost of covered health care benefits assumed for 2025 and thereafter (as a percent)   4.50%    
Year ultimate rate assumed for per capita cost of health care benefits is to be reached   2031    
Contributions and expected future benefit payments   $ 14    
Other Postretirement Benefits Plan [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Amortization period of actuarial gains and losses   5 years    
Other Postretirement Benefits Plan [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Amortization period of actuarial gains and losses   19 years