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Retirement Plans (Underfunded Accumulated Benefit Obligation) (Details) - Pension [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Retirement Plans [Line Items]    
Projected benefit obligation $ 522 $ 465
Accumulated benefit obligation 498 446
Fair value of plan assets
Underfunded accumulated benefit obligation $ (498) $ (446)