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Pension and Postretirement Plans (Narrative) (Details) - U.S. Qualified Pension Plan [Member] - USD ($)
$ in Millions
May 30, 2018
May 05, 2018
Defined Benefit Plan Disclosure [Line Items]    
Expected employer contributions for current fiscal year   $ 128
Subsequent Event [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Employer's contribution $ 30