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Retirement Plans and Profit Sharing Arrangements (Text) (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 28, 2010
Dec. 31, 2015
Dec. 31, 2014
Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
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   $ (97)  
Unrecognized prior service credit (cost) recognized in accumulated other comprehensive income   2  
Estimated amounts that will be amortized from AOCI into net periodic benefit cost - prior service credit (cost)   1  
Estimated amounts that will be amortized from AOCI into net periodic benefit cost - actuarial gain (loss)   (4)  
Accumulated benefit obligation for all pension plans   $ 740 $ 702
Defined Benefit Plan, Assets, Target Allocations      
Range of the difference between the actual allocation and target allocations (as a percent)   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 Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized actuarial gain (loss) recognized in accumulated other comprehensive income   $ 4  
Estimated amounts that will be amortized from AOCI into net periodic benefit cost - actuarial gain (loss)   $ 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)   65.00%  
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)   35.00%  
Other assets [Member] | Pension Plans [Member]      
Defined Benefit Plan, Assets, Target Allocations      
Target allocations (as a percent)   10.00%