Retirement Plans, Plan Assets (Details) (USD $) In Millions, unless otherwise specified																																																																	12 Months Ended
	Dec. 31, 2011 International [Member]	Dec. 31, 2010 International [Member]	Dec. 31, 2011 International [Member] Common/collective trust funds - Equity funds [Member]	Dec. 31, 2010 International [Member] Common/collective trust funds - Equity funds [Member]	Dec. 31, 2011 International [Member] Common/collective trust funds - Bond funds [Member]	Dec. 31, 2010 International [Member] Common/collective trust funds - Bond funds [Member]	Dec. 31, 2011 International [Member] Common/collective trust funds - Balanced funds [Member]	Dec. 31, 2010 International [Member] Common/collective trust funds - Balanced funds [Member]	Dec. 31, 2011 International [Member] United States equity securities [Member]	Dec. 31, 2010 International [Member] United States equity securities [Member]	Dec. 31, 2011 International [Member] Non-United States equity securities [Member]	Dec. 31, 2010 International [Member] Non-United States equity securities [Member]	Dec. 31, 2011 International [Member] Corporate bonds [Member]	Dec. 31, 2010 International [Member] Corporate bonds [Member]	Dec. 31, 2011 International [Member] Other asset [Member]	Dec. 31, 2010 International [Member] Other asset [Member]	Dec. 31, 2011 International [Member] Quoted Prices in Active Markets for Identical Assets [Member]	Dec. 31, 2010 International [Member] Quoted Prices in Active Markets for Identical Assets [Member]	Dec. 31, 2011 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Common/collective trust funds - Equity funds [Member]	Dec. 31, 2010 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Common/collective trust funds - Equity funds [Member]	Dec. 31, 2011 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Common/collective trust funds - Bond funds [Member]	Dec. 31, 2010 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Common/collective trust funds - Bond funds [Member]	Dec. 31, 2011 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Common/collective trust funds - Balanced funds [Member]	Dec. 31, 2010 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Common/collective trust funds - Balanced funds [Member]	Dec. 31, 2011 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] United States equity securities [Member]	Dec. 31, 2010 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] United States equity securities [Member]	Dec. 31, 2011 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Non-United States equity securities [Member]	Dec. 31, 2010 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Non-United States equity securities [Member]	Dec. 31, 2011 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Corporate bonds [Member]	Dec. 31, 2010 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Corporate bonds [Member]	Dec. 31, 2011 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Other asset [Member]	Dec. 31, 2010 International [Member] Quoted Prices in Active Markets for Identical Assets [Member] Other asset [Member]	Dec. 31, 2011 International [Member] Significant Observable Inputs for Similar Assets [Member]	Dec. 31, 2010 International [Member] Significant Observable Inputs for Similar Assets [Member]	Dec. 31, 2011 International [Member] Significant Observable Inputs for Similar Assets [Member] Common/collective trust funds - Equity funds [Member]	Dec. 31, 2010 International [Member] Significant Observable Inputs for Similar Assets [Member] Common/collective trust funds - Equity funds [Member]	Dec. 31, 2011 International [Member] Significant Observable Inputs for Similar Assets [Member] Common/collective trust funds - Bond funds [Member]	Dec. 31, 2010 International [Member] Significant Observable Inputs for Similar Assets [Member] Common/collective trust funds - Bond funds [Member]	Dec. 31, 2011 International [Member] Significant Observable Inputs for Similar Assets [Member] Common/collective trust funds - Balanced funds [Member]	Dec. 31, 2010 International [Member] Significant Observable Inputs for Similar Assets [Member] Common/collective trust funds - Balanced funds [Member]	Dec. 31, 2011 International [Member] Significant Observable Inputs for Similar Assets [Member] United States equity securities [Member]	Dec. 31, 2010 International [Member] Significant Observable Inputs for Similar Assets [Member] United States equity securities [Member]	Dec. 31, 2011 International [Member] Significant Observable Inputs for Similar Assets [Member] Non-United States equity securities [Member]	Dec. 31, 2010 International [Member] Significant Observable Inputs for Similar Assets [Member] Non-United States equity securities [Member]	Dec. 31, 2011 International [Member] Significant Observable Inputs for Similar Assets [Member] Corporate bonds [Member]	Dec. 31, 2010 International [Member] Significant Observable Inputs for Similar Assets [Member] Corporate bonds [Member]	Dec. 31, 2011 International [Member] Significant Observable Inputs for Similar Assets [Member] Other asset [Member]	Dec. 31, 2010 International [Member] Significant Observable Inputs for Similar Assets [Member] Other asset [Member]	Dec. 31, 2011 International [Member] Significant Unobservable Inputs [Member]	Dec. 31, 2010 International [Member] Significant Unobservable Inputs [Member]	Dec. 31, 2011 International [Member] Significant Unobservable Inputs [Member] Common/collective trust funds - Equity funds [Member]	Dec. 31, 2010 International [Member] Significant Unobservable Inputs [Member] Common/collective trust funds - Equity funds [Member]	Dec. 31, 2011 International [Member] Significant Unobservable Inputs [Member] Common/collective trust funds - Bond funds [Member]	Dec. 31, 2010 International [Member] Significant Unobservable Inputs [Member] Common/collective trust funds - Bond funds [Member]	Dec. 31, 2011 International [Member] Significant Unobservable Inputs [Member] Common/collective trust funds - Balanced funds [Member]	Dec. 31, 2010 International [Member] Significant Unobservable Inputs [Member] Common/collective trust funds - Balanced funds [Member]	Dec. 31, 2011 International [Member] Significant Unobservable Inputs [Member] United States equity securities [Member]	Dec. 31, 2010 International [Member] Significant Unobservable Inputs [Member] United States equity securities [Member]	Dec. 31, 2011 International [Member] Significant Unobservable Inputs [Member] Non-United States equity securities [Member]	Dec. 31, 2010 International [Member] Significant Unobservable Inputs [Member] Non-United States equity securities [Member]	Dec. 31, 2011 International [Member] Significant Unobservable Inputs [Member] Corporate bonds [Member]	Dec. 31, 2010 International [Member] Significant Unobservable Inputs [Member] Corporate bonds [Member]	Dec. 31, 2011 International [Member] Significant Unobservable Inputs [Member] Other asset [Member]	Dec. 31, 2010 International [Member] Significant Unobservable Inputs [Member] Other asset [Member]	Dec. 31, 2011 United Kingdom Pension Plan [Member]
Fair value of plan assets [Abstract]
Fair value of plan assets	$ 705	$ 691	$ 241	$ 155	$ 110	$ 97	$ 12	$ 14	$ 67	$ 41	$ 64	$ 133	$ 89	$ 84	$ 122	$ 167	$ 146	$ 256	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 67	$ 41	$ 64	$ 133	$ 0	$ 0	$ 15	$ 82	$ 468	$ 356	$ 241	$ 155	$ 110	$ 97	$ 12	$ 14	$ 0	$ 0	$ 0	$ 0	$ 89	$ 84	$ 16	$ 6	$ 91	$ 79	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 91	$ 79
Asset category, target allocations [Abstract]
Percentage of international pension plans' project benefit obligation (in hundredths)																																																																	74.00%
Equity securities target (in hundredths)																																																																	65.00%
Debt securities target (in hundredths)																																																																	35.00%