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Retirement Plans and Profit Sharing Arrangements (Text) (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 28, 2010
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase   4.01% 4.25%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets   7.18% 7.11% 7.13%
Benefits paid   $ (9) $ (9)  
Actuarial (gain) loss   $ 131 $ (59)  
Yield period of U.S. Treasury Note   5 years    
Minimum crediting rate (as a percent)   5.00%    
Period of graded schedule for vesting   3 years    
Minimum threshold percentage for amortization of actuarial gains and losses   10.00%    
Unrecognized actuarial gain (loss) recognized in accumulated other comprehensive income   $ (151)    
Unrecognized prior service credit (cost) recognized in accumulated other comprehensive income   11    
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment   7    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax   $ (2)    
Defined Benefit Plan, Assets, Target Allocations        
Range of the difference between the actual allocation and target allocations (as a percent)   5.00%    
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%
Pension Plans [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of Eligible Contribution 2.50% 2.50%    
Pension Plans [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of Eligible Contribution 10.00% 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    
Equity securities [Member] | Pension Plans [Member]        
Defined Benefit Plan, Assets, Target Allocations        
Target allocations (as a percent)   70.00%    
Target allocations for pooled pension funds (as a percent)   83.00%    
Debt securities [Member] | Pension Plans [Member]        
Defined Benefit Plan, Assets, Target Allocations        
Target allocations (as a percent)   20.00%    
Target allocations for pooled pension funds (as a percent)   17.00%    
Other assets [Member] | Pension Plans [Member]        
Defined Benefit Plan, Assets, Target Allocations        
Target allocations (as a percent)   10.00%