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Employee Benefit Plans (Narrative) (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
decimal
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Minimum Years Of Service For Eligible Employees Of Postretirement Plans 1 year    
Minimum Number Of Hours Worked By Employees | decimal 1,000    
Automatic Cash Contribution 2.00% 2.00% 2.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 22,000,000   $ 19,000,000
Defined Contribution Plan, Cost $ 67,000,000 $ 63,000,000 62,000,000
Total Company Common Stock Shares Held Under Defined Contribution Plan | shares 16,000,000 17,000,000  
Dividends Earned By Defined Contribution Plan $ 12,000,000 $ 11,000,000 $ 12,000,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 5.00% 5.00% 5.00%
Qualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation $ 1,500,000,000 $ 2,100,000,000  
Expected long-term rate of return on plan assets for net periodic benefit cost, next fiscal year 6.37%    
Number of shares held in plan assets relating to company's common stock (whole number) | shares 2,855,618    
Approximate percentage of company's common stock shares held in plan assets 3.00%    
Qualified Plan [Member] | Equity Securities [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation For Defined Benefit Plan Equity Securities 35.00%    
Qualified Plan [Member] | Fixed Income Securities [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation For Defined Benefit Plan Equity Securities 59.00%    
Qualified Plan [Member] | Other Security Investments [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation For Defined Benefit Plan Equity Securities 6.00%    
Qualified Plan [Member] | Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Market Value Of Companys Common Stock Held In Plan Assets $ 62,000,000    
Nonqualified Plan [Member] | Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation $ 127,000,000 $ 155,000,000