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Employee Benefits Schedule of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Expected Future Benefit Payments in Year One $ 51
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 51
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 52
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 53
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 54
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 270
Pension Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Expected Future Benefit Payments in Year One 44
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 44
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 45
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 46
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 46
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 239
Other Postretirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Expected Future Benefit Payments in Year One 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 6
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 20
Non Qualified Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Expected Future Benefit Payments in Year One 2
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 2
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 2
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 2
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 2
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter $ 11