Retirement Plans and Other Retiree Benefits Additional Disclosures (Details) (USD $) In Millions, unless otherwise specified	4 Months Ended	12 Months Ended		12 Months Ended							12 Months Ended											12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2011 United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2010 United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2012 United States Pension Plans of US Entity, Defined Benefit [Member] Real estate [Member] Level 3 [Member]		Dec. 31, 2011 United States Pension Plans of US Entity, Defined Benefit [Member] Real estate [Member] Level 3 [Member]		Dec. 31, 2012 United States Pension Benefits [Member] Real estate [Member] Level 3 [Member]	Dec. 31, 2011 United States Pension Benefits [Member] Real estate [Member] Level 3 [Member]	Dec. 31, 2012 International Pension Benefits [Member]	Dec. 31, 2011 International Pension Benefits [Member]	Dec. 31, 2010 International Pension Benefits [Member]	Dec. 31, 2012 International Pension Benefits [Member] Real estate [Member] Level 3 [Member]		Dec. 31, 2011 International Pension Benefits [Member] Real estate [Member] Level 3 [Member]		Dec. 31, 2012 Pension Benefits [Member]	Dec. 31, 2011 Pension Benefits [Member]	Dec. 31, 2012 Other Retiree Benefits [Member]	Dec. 31, 2011 Other Retiree Benefits [Member]	Dec. 31, 2010 Other Retiree Benefits [Member]	Dec. 31, 2012 Other Retiree Benefits [Member] Real estate [Member] Level 3 [Member]		Dec. 31, 2011 Other Retiree Benefits [Member] Real estate [Member] Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Change in Plan Asset Other				$ 0	$ 0								$ (5)	$ 0								$ 0	$ 0
Percentage of equity securities invested in the Company's common stock (in hundredths)				11.00%	11.00%
Dividends received by plans on the Company's common stock				4	3
Change in Benefit Obligations
Benefit obligations at beginning of year				2,025	1,952								760	736								776	762
Service Cost including ESOP				24	24								12	19								9	10
Interest cost				97	100	94							35	36	35							40	39	38
Participants' contributions				1	1								3	4								0	0
Acquisitions/plan amendments				0	0								21	1								(27)	0
Actuarial loss (gain)				200	126								103	21								119	(1)
Foreign exchange impact				0	0								21	(10)								1	(6)
Termination benefits				0	0								0	0								0	0
Curtailments and settlements				0	0								(23)	(14)								0	1
Benefit payments				(128)	(178)								(45)	(33)								(40)	(29)
Defined Benefit Plan, Other Changes				8	0								1	0								(3)	0
Benefit obligations at end of year				2,227	2,025	1,952							888	760	736							875	776	762
Change in Plan Assets
Fair value of plan assets at beginning of year				1,426	1,377		70	[1]	62	[1]	64	55	437	434		18	[1]	16				32	32		2	[1]	2	[1]
Earned income, net of management expenses											6	9				0		0
Actual return on plan assets				173	28								47	2								5	0
Unrealized gain (loss) on investment											2	2				1		1
Purchases, sales, issuances and settlements, net											0	(2)				1		1
Company's benefit plan contributions				125	198								57	45								40	29
Participants' contributions				1	1								3	4								0	0
Foreign exchange impact				0	0								13	(3)								0	0
Settlements				0	0								(21)	(12)								0	0
Benefit payments				(128)	(178)								(45)	(33)								(40)	(29)
Fair value of plan assets at end of year				1,597	1,426	1,377	70	[1]	62	[1]	72	64	486	437	434	20	[1]	18	[1]			37	32	32	2	[1]	2	[1]
Funded Status
Benefit obligations at end of year				2,227	2,025	1,952							888	760	736							875	776	762
Fair value of plan assets at end of year				1,597	1,426	1,377	70	[1]	62	[1]	72	64	486	437	434	20	[1]	18	[1]			37	32	32	2	[1]	2	[1]
Net amount recognized				(630)	(599)								(402)	(323)								(838)	(744)
Amounts Recognized in Balance Sheet
Noncurrent assets				0	0								2	0								0	0
Current liabilities		86	84	17	15								29	29								40	40
Noncurrent liabilities				613	584								375	294								798	704
Net amount recognized				(630)	(599)								(402)	(323)								(838)	(744)
Amounts recognized in Accumulated other comprehensive income consist of
Actuarial loss				932	855								235	174								421	323
Transition/prior service cost				63	73								26	6								2	32
Amounts recognized in accumulated other comprehensive income				995	928								261	180								423	355
Accumulated benefit obligation				2,093	1,892								798	688								0	0
Weighted-Average Assumptions Used to Determine Benefit Obligations
Discount Rate				4.14%	4.90%								3.57%	4.59%								4.32%	5.26%
Long-term rate of return on plan assets (in hundredths)				7.30%	7.75%								5.39%	5.91%								7.30%	7.75%
Long-term rate of compensation increase (in hundredths)				3.50%	4.00%								2.80%	2.87%								0.00%	0.00%
ESOP growth rate (in hundredths)				0.00%	0.00%								0.00%	0.00%								10.00%	10.00%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Medical Cost Trend Rate				0.00%	0.00%								0.00%	0.00%								7.50%	8.00%
Long-term rate of return on plan assets [Abstract]
Average annual rates of return for the most recent 1-year period (in hundredths)				13.00%
Average annual rates of return for the most recent 5-year period (in hundredths)				4.00%
Average annual rates of return for the most recent 10-year period (in hundredths)				8.00%
Average annual rates of return for the most recent 15-year period (in hundredths)				6.00%
Average annual rates of return for the most recent 25-year period (in hundredths)				8.00%
Benefit Obligation Exceeds Fair Value of Plan Assets
Projected benefit obligation																				3,112	2,770
Fair value of plan assets																				2,080	1,809
Accumulated benefit obligation																				2,855	2,525
Fair value of plan assets																				2,044	1,773
Assumed medical cost trend rates [Abstract]
Medical cost trend rate assumed for next fiscal year (in hundredths)																						7.50%
Ultimate medical cost trend rate (in hundredths)																						5.00%
Year which ultimate medical cost trend rate is reached																						2018
Defined Benfit Plan Health Care Cost Trend Rate After Ultimate Trend Rate Is Reached																						5.00%
Effect of a 1% change in the assumed medical cost trend rate [Abstract]
Effect of one percentage point increase on accumulated postretirement benefit obligation																						112
Effect of one percentage point decrease on accumulated postretirement benefit obligation																						(91)
Effect of one percentage point increase on annual expense																						9
Effect of one percentage point decrease on annual expense																						(7)
Components of Net Periodic Benefit Cost
Service cost				24	24	42							12	19	17							11	12	13
Interest cost				97	100	94							35	36	35							40	39	38
Annual ESOP allocation				0	0	0							0	0	0							(2)	(2)	(6)
Expected return on plan assets				(112)	(110)	(99)							(26)	(27)	(26)							(3)	(3)	(2)
Amortization of transition and prior service costs (credits)				9	9	5							2	3	3							3	2	1
Amortization of actuarial loss				62	46	52							9	9	9							18	16	19
Net periodic benefit cost				80	69	94							32	40	38							67	64	63
Other postretirement charges				0	0	23							9	3	1							1	1	8
Total pension cost				80	69	117							41	43	39							68	65	71
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.75%			4.90%	5.30%	5.75%							4.59%	5.04%	5.41%							5.26%	5.30%	5.75%
Long-term rate of return on plan assets (in hundredths)				7.75%	8.00%	8.00%							5.91%	6.23%	6.58%							7.75%	8.00%	8.00%
Long-term rate of compensation increase (in hundredths)				4.00%	4.00%	4.00%							2.87%	3.05%	3.35%							0.00%	0.00%	0.00%
ESOP growth rate (in hundredths)				0.00%	0.00%	0.00%							0.00%	0.00%	0.00%							10.00%	10.00%	10.00%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Medical Cost Trend Rate				0.00%	0.00%	0.00%							0.00%	0.00%	0.00%							8.00%	8.33%	9.00%
Voluntary contributions to postretirement plans				101	178	35
Estimated amounts that will be amortized from accumulated other comprehensive income [Abstract]
Net actuarial loss																				79		23
Net transition & prior service cost																				11		0
Voluntary contributions in next fiscal year				100
Exected Benefit Payments From Company Assets		94
Total benefit payments [Abstract]
2013		237		129									67									41
2014		220		128									50									42
2015		231		129									59									43
2016		227		129									54									44
2017		238		130									63									45
2018 - 2022		$ 1,305		$ 678									$ 393									$ 234

[1] Real estate is valued using the NAV per unit of funds that are invested in real property, and the real property is valued using independent market appraisals. Since the appraisals include unobservable inputs, the investments in each fund are classified as Level 3.