Employee Benefit Plans - Estimated Future Benefit Payments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Total Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2013	$ 325
2014	322
2015	320
2016	322
2017	319
2018 - 2022	1,599
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2013	223
2014	221
2015	220
2016	218
2017	217
2018 - 2022	1,071
International Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution in 2013	125
2013	102
2014	101
2015	100
2016	104
2017	102
2018 - 2022	528
Executive Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution in 2013	10
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution in 2013	5
2013	5
2014	5
2015	4
2016	3
2017	3
2018 - 2022	10
Postemployment Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution in 2013	42
2013	42
2014	39
2015	37
2016	36
2017	34
2018 - 2022	$ 144

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph g

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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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- Definition

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

+ References

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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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- Definition

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

+ References

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- Definition

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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