Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

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

	December 31
Millions of dollars	2016		2015
Amounts recognized on the Consolidated Balance Sheets
Accrued employee compensation and benefits	$	16	$	20
Employee compensation and benefits	227		155
Pension plans in which projected benefit obligation exceeded plan assets
Projected benefit obligation	$	1,083	$	1,042
Fair value of plan assets	840		867
Pension plans in which accumulated benefit obligation exceeded plan assets
Accumulated benefit obligation	$	1,037	$	964
Fair value of plan assets	840		846

Schedule of Allocation of Plan Assets [Table Text Block]

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

Millions of dollars	Level 1		Level 2		Level 3		Total
Cash and equivalents	$	—	$	49	$	—	$	49
Common/collective trust funds (a)
Equity funds (b)	—		197		—		197
Bond funds (c)	—		232		44		276
Alternatives funds (d)	—		221		—		221
Real estate funds (e)	—		36		35		71
Other assets	5		20		26		51
Fair value of plan assets at December 31, 2016	$	5	$	755	$	105	$	865
Cash and equivalents	$	—	$	46	$	—	$	46
Common/collective trust funds (a)
Equity funds (b)	—		209		—		209
Bond funds (c)	—		212		38		250
Alternatives fund (d)	—		231		—		231
Real estate funds (e)	—		42		46		88
Other assets	2		19		27		48
Fair value of plan assets at December 31, 2015	$	2	$	759	$	111	$	872

(a) Common/collective trust funds are valued at the net asset value of units held by the plans at year-end.

(b) Strategy is to invest in diversified funds of global common stocks.

(c) Strategy is to invest in diversified funds of fixed income securities of varying geographies and credit quality and whose cash flows approximate the maturities of the benefit obligation.

(d) Strategy is to invest in a fund of diversifying investments, including but not limited to reinsurance, commodities and currencies.

(e) Strategy is to invest in diversified funds of real estate investment trusts and private real estate.

Schedule of Assumptions Used [Table Text Block]

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

	2016	2015
Discount rate	2.9%	4.2%
Rate of compensation increase	4.8%	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:

	2016	2015	2014
Discount rate	4.2%	4.1%	4.8%
Expected long-term return on plan assets	5.3%	5.9%	6.4%
Rate of compensation increase	5.4%	5.3%	5.4%

Schedule of Expected Benefit Payments [Table Text Block]

The following table presents expected benefit payments over the next 10 years for our international pension plans.

Millions of dollars
2017	$	55
2018	46
2019	49
2020	50
2021	54
Years 2022 - 2026	317