Retirement Plans and Profit Sharing Arrangements (Text) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.96%	4.01%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.14%	7.18%	7.11%
Benefits paid	$ (10)	$ (9)
Actuarial (gain) loss	117	131
Unrecognized actuarial gain (loss) recognized in accumulated other comprehensive income	(214)
Unrecognized prior service credit (cost) recognized in accumulated other comprehensive income	10
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment	0	$ 7
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (2)
Defined Benefit Plan, Assets, Target Allocations
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate	5.00%	5.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate	5.00%	5.00%	5.00%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	$ 1	$ 1
Unrecognized actuarial gain (loss) recognized in accumulated other comprehensive income	3
Unrecognized prior service credit (cost) recognized in accumulated other comprehensive income	$ 1