Retirement Plans and Profit Sharing Arrangements (Benefit Obligations that Exceeded the Fair Value) (Details 4) - Pension Plans [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 1,100	$ 905
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	875	762
Fair value of plan assets	644	559
Plans with projected benefit obligations in excess of plan assets:
Projected benefit obligation	922	815
Fair value of plan assets	$ 644	$ 559