Retirement Plans and Profit Sharing Arrangements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Dec. 31, 2013 Pension Plans	Dec. 31, 2012 Pension Plans	Dec. 31, 2011 Pension Plans	Feb. 28, 2010 Pension Plans Maximum	Dec. 31, 2013 Pension Plans Maximum	Feb. 28, 2010 Pension Plans Minimum	Dec. 31, 2013 Pension Plans Minimum	Dec. 31, 2013 Other Postretirement Benefits	Dec. 31, 2012 Other Postretirement Benefits	Dec. 31, 2011 Other Postretirement Benefits
Defined Benefit Plan Disclosure
Accumulated Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain (Loss) after Tax	$ (55)							$ 5
Percentage of Eligible Contribution				10.00%	5.00%	2.50%	2.50%
Yield period of U.S. Treasury Note	5 years
Minimum crediting rate (as a percent)	5.00%
Defined benefit plans:
Service cost	46	41	38
Expected return on plan assets	(33)	(30)	(26)
Amortization of prior service costs	(1)	(1)	(1)
Amortization of net (gain)/loss	11	7	1
Other	2	4	4
Net periodic benefit cost	48	45	39					0	(1)	0
Minimum threshold percentage for amortization of actuarial gains and losses		10.00%
Change in benefit obligation
Benefit obligation at beginning of year	643	546						20	19
Service cost	46	41	38
Interest cost	23	24	23					1	1
Benefits paid	(7)	(7)						(4)	(4)
Participant contributions								2	3
Actuarial gain (loss)	(8)	51						(1)	1
Settlements	(23)	(15)
Foreign currency rate changes	2	3
Benefit obligation at end of year	676	643	546					18	20	19
Change in fair value of plan assets
Fair value of plan assets at the beginning of the year	437	362
Actual return on plan assets	85	49
Employer contributions	50	45
Benefits paid	(7)	(7)						(4)	(4)
Settlements	(23)	(15)
Foreign currency rate changes	2	3
Fair value of plan assets at the end of the year	544	437	362
Amounts recognized in the Consolidated Balance Sheets
Benefit liability	(136)	(214)
Benefit asset	4	8
Net amount recognized	(132)	(206)
Unrecognized prior service credit (cost) recognized in accumulated other comprehensive income	3							1
Estimated amounts that will be amortized from accumulated other comprehensive income (loss), net of tax, into net periodic benefit cost	1							1
Accumulated benefit obligation for all pension plans	605	576
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	514	503
Fair value of plan assets	418	333
Plans with projected benefit obligations in excess of plan assets:
Projected benefit obligation	554	547
Fair value of plan assets	$ 418	$ 333
Weighted average assumptions used to determine benefit obligations for pension plans
Discount rates (as a percent)	4.06%	3.45%						4.25%	3.40%
Rates of increase in compensation levels (as a percent)	4.38%	4.36%
Healthcare cost increase rates:
Following year (as a percent)								6.00%	6.50%
Decreasing to the year 2016 (as a percent)								5.00%	5.00%
Weighted average assumptions used to determine net periodic benefit cost for pension plans
Discount rates (as a percent)	3.45%	4.15%	4.75%
Rates of increase in compensation levels (as a percent)	4.36%	4.27%	4.25%
Expected long term rates of return on assets (as a percent)	7.62%	7.69%	8.00%
Range of the difference between the actual allocation and target allocations (as a percent)	5.00%