Employee Retirement Plans (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in Benefit Obligation:
Actuarial loss (gain)	$ 142
Change in Plan Assets:
Beginning Balance	1,022
Ending Balance	965
Pension [Member]
Change in Benefit Obligation:
Benefit obligation as of December 31	1,334	1,180	1,075
Service cost	28	27	27
Interest cost	63	63	68
Curtailment/settlement	(4)
Participant contributions	9	10
Benefits paid	(79)	(60)
Plan amendment	1	1
Actuarial loss (gain)	142	54
Foreign currency translation	(6)	10
Benefit obligation as of January 1	1,334	1,180	1,075
Change in Plan Assets:
Beginning Balance	1,022	881
Actual return on plan assets	(38)	133
Employer contributions	59.0	48.0
Participant contributions	9	10
Benefits paid	(79)	(60)
Curtailment/settlement	(4)
Foreign currency translation	(4)	10
Ending Balance	965	1,022	881
Funded status	(369)	(158)
Components on the Consolidated Balance Sheets:
Current liabilities	(6)	(6)
Noncurrent liabilities	(363)	(152)
Net liability as of December 31	(369)	(158)
Pretax Components in AOCI:
Net actuarial loss	521	303
Prior service cost (credit)	1	2
Total as of December 31	522	305
Postretirement [Member]
Change in Benefit Obligation:
Benefit obligation as of December 31	174	286	304
Service cost	6	7	7
Interest cost	14	17	19
Participant contributions	8	8
Benefits paid	(22)	(22)
Medicare Part D subsidy receipts	1	2
Plan amendment	(100)	(47)
Actuarial loss (gain)	(18)	15
Foreign currency translation	(1)	2
Benefit obligation as of January 1	174	286	304
Change in Plan Assets:
Beginning Balance	0	0
Employer contributions	14.0	14.0
Participant contributions	8	8
Benefits paid	(22)	(22)
Ending Balance	0	0	0
Funded status	(174)	(286)
Components on the Consolidated Balance Sheets:
Current liabilities	(16)	(18)
Noncurrent liabilities	(158)	(268)
Net liability as of December 31	(174)	(286)
Pretax Components in AOCI:
Net actuarial loss	25	44
Prior service cost (credit)	(250)	(173)
Total as of December 31	$ (225)	$ (129)