Retirement Benefits - Status (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Change in Plan Assets
Settlements	$ (1,200,000,000)
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Prior service cost/(credit)	(44,000,000)
(Gains)/Losses	1,645,000,000
U.S. Plans
Change in Benefit Obligation
Benefit obligation at January 1	48,816,000,000	46,647,000,000
Service cost	521,000,000	467,000,000	376,000,000
Interest cost	2,208,000,000	2,374,000,000
Amendments	(39,000,000)	5,000,000
Separation programs and other	(40,000,000)	(52,000,000)
Curtailments	0	0
Settlements	(1,123,000,000)	0
Plan participant contributions	27,000,000	23,000,000
Benefits paid	(3,427,000,000)	(3,534,000,000)
Foreign exchange translation	0	0
Divestiture	0	0
Actuarial (gain)/loss	5,182,000,000	2,886,000,000
Benefit obligation at December 31	52,125,000,000	48,816,000,000	46,647,000,000
Change in Plan Assets
Fair value of plan assets at January 1	39,414,000,000	39,960,000,000
Actual return on plan assets	5,455,000,000	2,887,000,000
Company contributions	2,134,000,000	132,000,000
Plan participant contributions	27,000,000	23,000,000
Benefits paid	(3,427,000,000)	(3,534,000,000)
Settlements	(1,123,000,000)	0
Foreign exchange translation	0	0
Divestiture	0	0
Other	(85,000,000)	(54,000,000)
Fair value of plan assets at December 31	42,395,000,000	39,414,000,000	39,960,000,000
Funded status at December 31	(9,730,000,000)	(9,402,000,000)
Amounts Recognized on the Balance Sheet
Prepaid assets	0	0
Accrued liabilities	(9,730,000,000)	(9,402,000,000)
Total	(9,730,000,000)	(9,402,000,000)
Amounts Recognized in Accumulated Other Comprehensive Loss (pre-tax)
Unamortized prior service costs/(credits)	938,000,000	1,197,000,000
Unamortized net (gains)/losses	11,349,000,000	9,394,000,000
Total	12,287,000,000	10,591,000,000
Pension Plans in which Accumulated Benefit Obligation Exceeds Plan Assets at December 31
Accumulated benefit obligation	50,821,000,000	47,555,000,000
Fair value of plan assets	42,395,000,000	39,414,000,000
Accumulated Benefit Obligation at December 31	50,821,000,000	47,555,000,000
Pension Plans in which Projected Benefit Obligation Exceeds Plan Assets at December 31
Projeced benefit obligation	52,125,000,000	48,816,000,000
Fair value of plan assets	42,395,000,000	39,414,000,000
Incremental settlement loss	250,000,000
Weighted Average Assumptions at December 31
Discount rate	3.84%	4.64%
Expected return on assets	7.38%	7.50%
Average rate of increase in compensation	3.80%	3.80%
Assumptions Used to Determine Net Benefit Cost for the Year
Discount rate	4.64%	5.24%
Expected return on assets	7.50%	8.00%
Average rate of increase in compensation	3.80%	3.80%
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Prior service cost/(credit)	174,000,000
(Gains)/Losses	778,000,000
Plan Contributions [Abstract]
Pension and Other Postretirement Benefit Contributions	2,000,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	3,400,000,000
Estimated Future Benefit Payments
2013	5,940,000,000
2014	3,320,000,000
2015	3,250,000,000
2016	3,200,000,000
2017	3,160,000,000
2018 - 2022	15,330,000,000
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Expected return on assets	7.38%	7.50%
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Defined Benefit Plan Actual Rate Of Return On Plan Assets Period	P10Y	P10Y
Defined Benefit Plan Actual Ten Year Rate Of Return On Plan Assets	11.10%	8.60%
Non-U.S. Plans
Change in Benefit Obligation
Benefit obligation at January 1	25,163,000,000	23,385,000,000
Service cost	372,000,000	327,000,000	314,000,000
Interest cost	1,189,000,000	1,227,000,000
Amendments	222,000,000	38,000,000
Separation programs and other	202,000,000	196,000,000
Curtailments	0	0
Settlements	0	(152,000,000)
Plan participant contributions	36,000,000	46,000,000
Benefits paid	(1,420,000,000)	(1,373,000,000)
Foreign exchange translation	803,000,000	(441,000,000)
Divestiture	0	0
Actuarial (gain)/loss	4,135,000,000	1,910,000,000
Benefit obligation at December 31	30,702,000,000	25,163,000,000	23,385,000,000
Change in Plan Assets
Fair value of plan assets at January 1	19,198,000,000	18,615,000,000
Actual return on plan assets	1,637,000,000	934,000,000
Company contributions	1,629,000,000	1,403,000,000
Plan participant contributions	36,000,000	46,000,000
Benefits paid	(1,420,000,000)	(1,373,000,000)
Settlements	0	(152,000,000)
Foreign exchange translation	641,000,000	(267,000,000)
Divestiture	0	0
Other	(8,000,000)	(8,000,000)
Fair value of plan assets at December 31	21,713,000,000	19,198,000,000	18,615,000,000
Funded status at December 31	(8,989,000,000)	(5,965,000,000)
Amounts Recognized on the Balance Sheet
Prepaid assets	85,000,000	114,000,000
Accrued liabilities	(9,074,000,000)	(6,079,000,000)
Total	(8,989,000,000)	(5,965,000,000)
Amounts Recognized in Accumulated Other Comprehensive Loss (pre-tax)
Unamortized prior service costs/(credits)	487,000,000	323,000,000
Unamortized net (gains)/losses	11,375,000,000	7,612,000,000
Total	11,862,000,000	7,935,000,000
Pension Plans in which Accumulated Benefit Obligation Exceeds Plan Assets at December 31
Accumulated benefit obligation	21,653,000,000	18,138,000,000
Fair value of plan assets	14,625,000,000	13,207,000,000
Accumulated Benefit Obligation at December 31	28,136,000,000	23,524,000,000
Pension Plans in which Projected Benefit Obligation Exceeds Plan Assets at December 31
Projeced benefit obligation	29,984,000,000	24,184,000,000
Fair value of plan assets	20,910,000,000	18,105,000,000
Weighted Average Assumptions at December 31
Discount rate	3.92%	4.84%
Expected return on assets	6.74%	6.77%
Average rate of increase in compensation	3.41%	3.39%
Assumptions Used to Determine Net Benefit Cost for the Year
Discount rate	4.84%	5.31%
Expected return on assets	6.77%	7.20%
Average rate of increase in compensation	3.39%	3.34%
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Prior service cost/(credit)	68,000,000
(Gains)/Losses	707,000,000
Estimated Future Benefit Payments
2013	1,370,000,000
2014	1,350,000,000
2015	1,380,000,000
2016	1,410,000,000
2017	1,450,000,000
2018 - 2022	7,690,000,000
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Expected return on assets	6.74%	6.77%
Canadian [Member]
Weighted Average Assumptions at December 31
Expected return on assets	6.75%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Expected return on assets	6.75%
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Defined Benefit Plan Actual Ten Year Rate Of Return On Plan Assets	6.40%	4.60%
United Kingdom
Weighted Average Assumptions at December 31
Expected return on assets	7.25%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Expected return on assets	7.25%
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Defined Benefit Plan Actual Ten Year Rate Of Return On Plan Assets	8.70%	6.00%
Worldwide OPEB [Member]
Change in Benefit Obligation
Benefit obligation at January 1	6,593,000,000	6,423,000,000
Service cost	67,000,000	63,000,000	54,000,000
Interest cost	290,000,000	327,000,000
Amendments	(156,000,000)	(62,000,000)
Separation programs and other	3,000,000	10,000,000
Curtailments	0	(50,000,000)
Settlements	0	0
Plan participant contributions	29,000,000	29,000,000
Benefits paid	(454,000,000)	(473,000,000)
Foreign exchange translation	47,000,000	(62,000,000)
Divestiture	0	0
Actuarial (gain)/loss	391,000,000	388,000,000
Benefit obligation at December 31	6,810,000,000	6,593,000,000	6,423,000,000
Change in Plan Assets
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Company contributions	0	0
Plan participant contributions	29,000,000	29,000,000
Plan participant contributions	0	0
Benefits paid	0	0
Settlements	0	0
Foreign exchange translation	0	0
Divestiture	0	0
Other	0	0
Fair value of plan assets at December 31	0	0	0
Funded status at December 31	(6,810,000,000)	(6,593,000,000)
Amounts Recognized on the Balance Sheet
Prepaid assets	0	0
Accrued liabilities	(6,810,000,000)	(6,593,000,000)
Total	(6,810,000,000)	(6,593,000,000)
Amounts Recognized in Accumulated Other Comprehensive Loss (pre-tax)
Unamortized prior service costs/(credits)	(1,263,000,000)	(1,648,000,000)
Unamortized net (gains)/losses	2,594,000,000	2,305,000,000
Total	1,331,000,000	657,000,000
Weighted Average Assumptions at December 31
Discount rate	3.80%	4.60%
Expected return on assets	0.00%	0.00%
Average rate of increase in compensation	3.80%	3.80%
Assumptions Used to Determine Net Benefit Cost for the Year
Discount rate	4.60%	5.20%
Expected return on assets	0.00%	0.00%
Average rate of increase in compensation	3.80%	3.80%
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Prior service cost/(credit)	(286,000,000)
(Gains)/Losses	160,000,000
Plan Contributions [Abstract]
Pension and Other Postretirement Benefit Contributions	3,400,000,000
Pension and Other Postretirement Benefit Contributions Unfunded Plans	400,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	5,000,000,000
Pension And Other Postretirement Expected Benefit Contributions Unfunded Plans	400,000,000
Pension and Other Postretirement Benefit Contributions and Expected Future Employer Contributions To Funded and Unfunded Plans	5,400,000,000
Estimated Future Benefit Payments
2013	440,000,000
2014	400,000,000
2015	390,000,000
2016	390,000,000
2017	380,000,000
2018 - 2022	1,890,000,000
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Expected return on assets	0.00%	0.00%
Belgium
Pension Plans in which Projected Benefit Obligation Exceeds Plan Assets at December 31
Recognized settlement loss		109,000,000
Maximum [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan Percent Of Employer And Related Party Securities Included In Plan Assets Maximum	2.00%
Fixed Income \| U.S. Plans
Change in Plan Assets
Fair value of plan assets at January 1	22,070,000,000
Fair value of plan assets at December 31	22,456,000,000
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Plan Asset Allocations	80.00%
Fixed Income \| Non-U.S. Plans
Change in Plan Assets
Fair value of plan assets at December 31	8,146,000,000	7,837,000,000
Fixed Income \| Maximum [Member] \| Greece, Ireland, Italy, Portugal, Spain [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	2.00%
Alternatives
Alternative Assets [Abstract]
Lagged Valuation Adjustments Range, Low	P1M
Lagged Valuation Adjustments Range, High	P6M
Alternatives \| U.S. Plans
Change in Plan Assets
Fair value of plan assets at December 31	5,990,000,000	5,415,000,000
Alternatives \| Non-U.S. Plans
Change in Plan Assets
Fair value of plan assets at December 31	1,708,000,000	1,337,000,000
Growth Assets [Member] \| U.S. Plans
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Plan Asset Allocations	20.00%
Real Estate Investment [Member]
Alternative Assets [Abstract]
Lagged Valuation Adjustments Amount	24,000,000	13,000,000
Hedge Funds [Member]
Alternative Assets [Abstract]
Lagged Valuation Adjustments Range, Low	P1M
Lagged Valuation Adjustments Range, High	P3M
Lagged Valuation Adjustments Amount	33,000,000	(10,000,000)
Hedge Funds [Member] \| U.S. Plans
Change in Plan Assets
Fair value of plan assets at December 31	3,121,000,000	2,968,000,000
Hedge Funds [Member] \| Non-U.S. Plans
Change in Plan Assets
Fair value of plan assets at December 31	1,142,000,000	1,053,000,000
Private Equity Funds [Member]
Alternative Assets [Abstract]
Lagged Valuation Adjustments Range, Low	P1M
Lagged Valuation Adjustments Range, High	P6M
Lagged Valuation Adjustments Amount	56,000,000	6,000,000
Private Equity Funds [Member] \| U.S. Plans
Change in Plan Assets
Fair value of plan assets at December 31	2,412,000,000	2,085,000,000
Private Equity Funds [Member] \| Non-U.S. Plans
Change in Plan Assets
Fair value of plan assets at December 31	$ 236,000,000	$ 123,000,000

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The period used to calculate the actual rate of return on plan assets.

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No definition available.

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The ten year actual rate of return on plan assets.

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No definition available.

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- Definition

An assumption as to the expected long-term rate of return on plan assets.

+ References

No definition available.

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- Definition

Defined Benefit Plan Benefits Paid Change In Plan Assets Net Of Certain Adjustments

+ References

No definition available.

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Defined Benefit Plan Benefits Paid Net Of Certain Adjustments

+ References

No definition available.

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- Definition

Defined Benefit Plan, Contributions by Plan Participants, Net of Certain Adustments

+ References

No definition available.

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- Definition

The expense related to separation programs (terminations) for a defined benefit pension plan or other defined benefit postretirement plan, excluding the plan of a disposal group or discontinued operations.

+ References

No definition available.

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- Definition

The increase due to the passage of time in the projected benefit obligation or the accumulated postretirement benefit obligation of a defined benefit pension plan, excluding the plan of a disposal group or discontinued operations.

+ References

No definition available.

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- Definition

This represents the net assets recognized in the balance sheet that are associated with the defined benefit plans.

+ References

No definition available.

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- Definition

The amount of increase or decrease in the fair value of plan assets attributed to other causes during the reporting period.

+ References

No definition available.

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

No definition available.

+ Details

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- Definition

The maximum percent of employer securities or securities of parties related to the employer that are included in plan assets.

+ References

No definition available.

+ Details

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- Definition

Amount of net gain (loss) recognized in net period benefit cost as a result of a change in accounting policy for recognizing unamortized gains or losses upon the settlement of plan obligations.

+ References

No definition available.

+ Details

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- Definition

The value of the adjustment recorded to reflect the change in value between the date net assets value is available in the investee fund compared to the reporting entities' measurement date (timing lag).

+ References

No definition available.

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- Definition

The high range of the number of periods (typically expressed in months) that exists between the date net assets value are available in the investee fund compared to the reporting entities' measurement date (timing lag).

+ References

No definition available.

+ Details

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- Definition

The low range of the number of periods (typically expressed in months) that exists between the date net assets value are available in the investee fund compared to the reporting entities' measurement date (timing lag).

+ References

No definition available.

+ Details

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- Definition

This element represents the sum of cash or cash equivalent contributions made and the expected future contributions to be made in the current fiscal year, directly by the entity to funded pension plans and unfunded pension plan beneficiaries.

+ References

No definition available.

+ Details

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- Definition

The amount of cash or cash equivalents paid directly by the entity to unfunded pension plan beneficiaries during the reporting period.

+ References

No definition available.

+ Details

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- Definition

This represents the net liability recognized in the balance sheet that is associated with the defined benefit plans.

+ References

No definition available.

+ Details

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- Definition

Pension And Other Postretirement Expected Benefit Contributions Unfunded Plans

+ References

No definition available.

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

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- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 158

-Paragraph 7

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph i

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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Expected rate of compensation increases (for pay-related plans).

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Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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