Retirement Plans and Profit Sharing Arrangements (Benefit Obligations that Exceeded the Fair Value) (Details 4) - Pension Plans [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 905	$ 916
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	762	759
Fair value of plan assets	559	562
Plans with projected benefit obligations in excess of plan assets:
Projected benefit obligation	815	816
Fair value of plan assets	$ 559	$ 562

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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