Retirement Plans and Profit Sharing Arrangements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			2 Months Ended	10 Months Ended	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2011 Pension Plans	Dec. 31, 2010 Pension Plans	Dec. 31, 2009 Pension Plans	Feb. 28, 2010 Pension Plans Maximum	Dec. 31, 2010 Pension Plans Maximum	Feb. 28, 2010 Pension Plans Minimum	Dec. 31, 2010 Pension Plans Minimum	Dec. 31, 2011 Other Postretirement Benefits	Dec. 31, 2010 Other Postretirement Benefits	Dec. 31, 2009 Other Postretirement Benefits
Defined Benefit Plan Disclosure
Percentage of Eligible Contribution				10.00%	5.00%	2.50%	2.50%
Yield period of U.S. Treasury Note (in years)	5
Minimum crediting rate (as a percent)	5.00%
Components of Net Periodic Pension Cost
Service cost	$ 38	$ 33	$ 32
Interest cost	23	23	25					1	1
Expected return on plan assets	(26)	(23)	(22)
Amortization of prior service costs	(1)	(2)	(1)
Amortization of net (gain)/loss	1
Other	4	3	3
Net periodic benefit cost	39	34	37							2
Minimum threshold percentage for amortization of actuarial gains and losses	10.00%
Change in benefit obligation
Benefit obligation at beginning of year	469	421						21	22
Service cost	38	33	32
Interest cost	23	23	25					1	1
Benefits paid	(6)	(6)						(5)	(5)
Participant contributions								4	4
Actuarial loss	40	23						(2)	(1)
Settlements	(18)	(24)
Foreign currency rate changes		(1)
Benefit obligation at end of year	546	469	421					19	21	22
Change in fair value of plan assets
Fair value of plan assets at the beginning of the year	327	256
Actual return on plan assets	(12)	39
Employer contributions	72	64
Benefits paid	(6)	(6)						(5)	(5)
Settlements	(18)	(24)
Foreign currency rate changes	(1)	(2)
Fair value of plan assets at the end of the year	362	327	256
Amounts recognized in the Consolidated Balance Sheets
Benefit liability	(189)	(162)
Benefit asset	5	20
Net amount recognized	(184)	(142)
Unrecognized actuarial gain (loss) recognized in accumulated other comprehensive income (loss)	(87)							(7)
Unrecognized prior service credit (cost) recognized in accumulated other comprehensive income (loss)	(5)
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	493	423
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	434	376
Fair value of plan assets	282	248
Plans with projected benefit obligations in excess of plan assets:
Projected benefit obligation	470	410
Fair value of plan assets	$ 282	$ 248
Weighted average assumptions used to determine benefit obligations for pension plans
Discount rates (as a percent)	4.15%	4.75%						4.15%	4.90%
Rates of increase in compensation levels (as a percent)	4.27%	4.25%
Healthcare cost increase rates:
Following year (as a percent)								7.00%	7.50%
Decreasing to the year 2017 (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)	4.75%	5.28%	6.22%
Rates of increase in compensation levels (as a percent)	4.25%	4.22%	4.23%
Expected long term rates of return on assets (as a percent)	8.00%	8.00%	8.20%