Pension and Other Postretirement Employee Benefit Plans - Defined Benift Pension Plans (Details) (USD $)	1 Months Ended		12 Months Ended
	Aug. 31, 2009	Jan. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan, Changes in Benefit Obligations and Plan Assets and Funded Status Amounts [Abstract]
Defined Contribution Plan Employer Matching Contribution Percent			5.00%
Defined Contribution Plan Employee Annual Compensation Amount Not Eligible For Employers Matching Contributions			$ 250,000
Defined Benefit Pension Plans and OPEB Plans [Member] | Overfunded Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded/(unfunded) status			2,600,000,000	3,500,000,000
Defined Benefit Pension Plans and OPEB Plans [Member] | Underfunded Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded/(unfunded) status			621,000,000	561,000,000
Defined Benefit Pension Plans [Member]
Funded status of plan - supplemental information
Unfunded Postretirement Benefit Obligation, U.K. Plan			33,000,000	36,000,000
Defined Benefit Pension Plans, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax			(165,000,000)	(225,000,000)	(304,000,000)
Defined Benefit Plan, Changes in Benefit Obligations and Plan Assets and Funded Status Amounts [Abstract]
Pension Contributions	1,500,000,000	1,300,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year			0
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of year			(8,320,000,000)	(7,977,000,000)
Benefits earned during the period			(249,000,000)	(230,000,000)
Interest cost on benefit obligations			(451,000,000)	(468,000,000)
Plan amendments			0	0
Business combinations			0	0
Net gain/(loss)			(563,000,000)	(249,000,000)
Benefits paid			540,000,000	604,000,000
Curtailments			0	0
Settlements			0	0
Special termination benefits			0	0
Foreign exchange impact and other			0	0
Benefit obligation, end of year			(9,043,000,000)	(8,320,000,000)	(7,977,000,000)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year			10,828,000,000	10,218,000,000
Actual return on plan assets			147,000,000	1,179,000,000
Firm contributions			37,000,000	35,000,000
Employee contributions			0	0
Benefits paid			(540,000,000)	(604,000,000)
Settlements			0	0
Foreign exchange impact and other			0	0
Fair value of plan assets, end of year			10,472,000,000	10,828,000,000	10,218,000,000
Funded/(unfunded) status			1,429,000,000	2,508,000,000
Accumulated benefit obligation, end of year			(9,008,000,000)	(8,271,000,000)
Defined Benefit Pension Plans, U.S. [Member] | Accrued Liabilities [Member]
Funded status of plan - supplemental information
Defined Benefit Plan Amounts Not Measured At Fair Value			245,000,000	187,000,000
Defined Benefit Pension Plans, U.S. [Member] | Participation Rights Under Participating Annuity Contracts [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, end of year			426,000,000	385,000,000
Defined Benefit Pension Plans, U.S. [Member] | Accrued Receivables [Member]
Funded status of plan - supplemental information
Defined Benefit Plan Amounts Not Measured At Fair Value			50,000,000	52,000,000
Defined Benefit Pension Plans, Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax			(48,000,000)	(56,000,000)	(44,000,000)
Defined Benefit Plan, Changes in Benefit Obligations and Plan Assets and Funded Status Amounts [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year			49,000,000
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of year			(2,600,000,000)	(2,536,000,000)
Benefits earned during the period			(36,000,000)	(30,000,000)
Interest cost on benefit obligations			(133,000,000)	(128,000,000)
Plan amendments			0	10,000,000
Business combinations			0	(12,000,000)
Employee contributions			(5,000,000)	(4,000,000)
Net gain/(loss)			(160,000,000)	(71,000,000)
Benefits paid			93,000,000	96,000,000
Curtailments			0	0
Settlements			0	5,000,000
Special termination benefits			0	(1,000,000)
Foreign exchange impact and other			12,000,000	71,000,000
Benefit obligation, end of year			(2,829,000,000)	(2,600,000,000)	(2,536,000,000)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year			2,647,000,000	2,432,000,000
Actual return on plan assets			277,000,000	228,000,000
Firm contributions			169,000,000	157,000,000
Employee contributions			5,000,000	4,000,000
Benefits paid			(93,000,000)	(96,000,000)
Settlements			0	(5,000,000)
Foreign exchange impact and other			(16,000,000)	(73,000,000)
Fair value of plan assets, end of year			2,989,000,000	2,647,000,000	2,432,000,000
Funded/(unfunded) status			160,000,000	47,000,000
Accumulated benefit obligation, end of year			(2,800,000,000)	(2,576,000,000)
Defined Benefit Pension Plans, Non-U.S. [Member] | Accrued Liabilities [Member]
Funded status of plan - supplemental information
Defined Benefit Plan Amounts Not Measured At Fair Value			69,000,000
Defined Benefit Pension Plans, Non-U.S. [Member] | Accrued Receivables [Member]
Funded status of plan - supplemental information
Defined Benefit Plan Amounts Not Measured At Fair Value			56,000,000	9,000,000
Defined Benefit Pension Plans, Non-U.S. [Member] | Contractually Required Payments [Member]
Defined Benefit Plan, Changes in Benefit Obligations and Plan Assets and Funded Status Amounts [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year			37,000,000
Defined Benefit Pension Plans, Excess Retirement Plan [Member]
Defined Benefit Plan, Changes in Benefit Obligations and Plan Assets and Funded Status Amounts [Abstract]
Defined Benefit Plan Benefit Obligation Excess Retirement Plan			272,000,000	266,000,000
OPEB Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax			(1,000,000)	1,000,000	0
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of year			(980,000,000)	(1,025,000,000)
Benefits earned during the period			(1,000,000)	(2,000,000)
Interest cost on benefit obligations			(51,000,000)	(55,000,000)
Plan amendments			0	0
Business combinations			0	0
Employee contributions			(84,000,000)	(70,000,000)
Net gain/(loss)			(39,000,000)	13,000,000
Benefits paid			166,000,000	168,000,000
Expected Medicare Part D subsidy receipts			(10,000,000)	(10,000,000)
Curtailments			0	0
Settlements			0	0
Special termination benefits			0	0
Foreign exchange impact and other			0	1,000,000
Benefit obligation, end of year			(999,000,000)	(980,000,000)	(1,025,000,000)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year			1,381,000,000	1,269,000,000
Actual return on plan assets			78,000,000	137,000,000
Firm contributions			2,000,000	3,000,000
Employee contributions			0	0
Benefits paid			(26,000,000)	(28,000,000)
Settlements			0	0
Foreign exchange impact and other			0	0
Fair value of plan assets, end of year			1,435,000,000	1,381,000,000	1,269,000,000
Funded/(unfunded) status			$ 436,000,000	$ 401,000,000