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Pension and Other Benefit Programs - Effect on Accumulated Other Comprehensive Income (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Unrecognized net actuarial losses (gains), after tax $ 67
Pension Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Unrecognized net actuarial losses (gains), after tax 87
SERP Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Unrecognized net actuarial losses (gains), after tax 6
Post-retirement Benefit Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Unrecognized net actuarial losses (gains), after tax $ (26)