v3.19.3.a.u2
Employee Benefit Plans (Information About The Expected Cash Flows For The Qualified and Non-Qualified Pension Plans) (Details)
Dec. 31, 2019
USD ($)
Qualified Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 0
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 126,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 135,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 135,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 134,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 135,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter 667,000,000
Nonqualified Plan [Member] | Supplemental Employee Retirement Plan [Member]  
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 11,000,000
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 11,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 30,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 29,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 14,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 10,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 59,000,000