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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation $ 243 $ 212  
Defined Contribution Plan, Cost 19 16 $ 15
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 16 17 14
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 18    
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 6 $ 6 $ 6
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 2    
Debt Securities [Member]      
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities 40.00%    
Equity Securities [Member]      
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities 60.00%