Income Taxes Components of current and long-term deferred income taxes (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets [Member]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals [Abstract]
Employee benefits	$ 114	$ 94
Depreciation and amortization	(2)	(1)
Other accruals and adjustments	293	224
Deferred Tax Assets (Liabilities), Net [Abstract]
Other items	0	0
United States federal income tax loss carryforwards	0	0
United States federal income tax credit carryforwards	0	0
United States state and local tax loss carryforwards and tax credit carryforwards	0	0
Non-United States tax loss carryforward	0	0
Non-United States income tax credit carryforwards	0	0
Valuation allowance for income tax loss and income tax credit carryforwards	0	0
Other valuation allowance	(7)	(14)
Total deferred income taxes	398	303
Long-term assets and liabilities [Member]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals [Abstract]
Employee benefits	778	681
Depreciation and amortization	(498)	(567)
Other accruals and adjustments	77	90
Deferred Tax Assets (Liabilities), Net [Abstract]
Other items	(4)	(6)
United States federal income tax loss carryforwards	7	5
United States federal income tax credit carryforwards	251	253
United States state and local tax loss carryforwards and tax credit carryforwards	65	74
Non-United States tax loss carryforward	417	360
Non-United States income tax credit carryforwards	95	72
Valuation allowance for income tax loss and income tax credit carryforwards	(441)	(421)
Other valuation allowance	(55)	(27)
Total deferred income taxes	$ 692	$ 514