Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Fair value of pension plan assets by category

The following table sets forth by level within the fair value hierarchy the fair value of assets held by our international pension plans.

Millions of dollars	Level 1		Level 2		Level 3		Total
Common/collective trust funds (a)
Equity funds	$	—	$	204	$	—	$	204
Bond funds	—		112		—		112
Balanced funds	—		13		—		13
Non-United States equity securities	130		—		—		130
United States equity securities	110		—		—		110
Corporate bonds	—		107		—		107
Other assets	27		16		35		78
Fair value of plan assets at December 31, 2012	$	267	$	452	$	35	$	754
Common/collective trust funds (a)
Equity funds	$	—	$	241	$	—	$	241
Bond funds	—		110		—		110
Balanced funds	—		12		—		12
Corporate bonds	—		89		—		89
United States equity securities	67		—		—		67
Non-United States equity securities	64		—		—		64
Other assets	15		16		91		122
Fair value of plan assets at December 31, 2011	$	146	$	468	$	91	$	705

(a) Strategies are generally to invest in equity or debt securities, or a combination thereof, that match or outperform certain predefined indices.

Weighted-average assumptions for principal retirement and other postretirement benefit plans

Certain weighted-average actuarial assumptions used to determine benefit obligations of our international pension plans at December 31 were as follows:

	2012	2011
Discount rate	4.8%	5.2%
Rate of compensation increase	5.5%	5.4%

Certain weighted-average actuarial assumptions used to determine net periodic benefit cost of our international pension plans for the years ended December 31 were as follows:

	2012	2011	2010
Discount rate	5.2%	7.1%	7.9%
Expected long-term return on plan assets	6.5%	5.7%	5.6%
Rate of compensation increase	5.4%	6.2%	6.4%

Schedule of Net Benefit Costs [Table Text Block]

The following table presents additional information about our international pension plans.

	December 31
Millions of dollars	2012		2011
Amounts recognized on the Consolidated Balance Sheets
Accrued employee compensation and benefits	$	10	$	10
Employee compensation and benefits	266		213
Pension plans in which projected benefit obligation exceeded plan assets
Projected benefit obligation	$	1,004	$	928
Fair value of plan assets	727		705
Pension plans in which accumulated benefit obligation exceeded plan assets
Accumulated benefit obligation	$	935	$	784
Fair value of plan assets	726		621