Defined Benefit Postretirement Plans and Defined Contribution Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Accumulated benefit obligation	$ (1,403)		$ (1,359)
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	(894)		(933)
Accumulated benefit obligation	(793)		(791)
Fair value of plan assets	574		625
Change in benefit obligations:
Benefit obligations at January 1	933		1,146
Service cost	31		33
Interest cost	35		40
Actuarial loss	174		(140)
Foreign currency exchange rate changes	0		0
Benefits paid	(279)		(146)
Benefit obligations at December 31	894		933
Change in plan assets:
Fair value of plan assets at January 1	625		630
Actual return on plan assets	59		65
Employer contributions	169		76
Foreign currency exchange rate changes	0		0
Benefits paid	(279)		(146)
Fair value of plan assets at December 31	574		625
Funded status of plans at December 31
Funded status of plans at December 31	(320)		(308)
Amounts recognized in the consolidated balance sheet:
Current liabilities	(11)		(16)
Noncurrent liabilities	(309)		(292)
Accrued benefit cost	(320)		(308)
Pretax amounts in accumulated other comprehensive loss:
Net loss	283		262
Prior service cost (credit)	10		15
Foreign Pension Plans, Defined Benefit [Member]
Change in benefit obligations:
Benefit obligations at January 1	649		565
Service cost	16		22
Interest cost	27		24
Actuarial loss	46		40
Foreign currency exchange rate changes	(39)		11
Divestiture	(29)
Benefits paid	(19)		(13)
Benefit obligations at December 31	651		649
Change in plan assets:
Fair value of plan assets at January 1	597		500
Actual return on plan assets	59		74
Employer contributions	37		23
Foreign currency exchange rate changes	(39)		13
Divestiture	(13)	[1]
Benefits paid	(19)		(13)
Fair value of plan assets at December 31	622		597
Funded status of plans at December 31
Funded status of plans at December 31	(29)		(52)
Amounts recognized in the consolidated balance sheet:
Current liabilities	0		0
Noncurrent liabilities	(29)		(52)
Accrued benefit cost	(29)		(52)
Pretax amounts in accumulated other comprehensive loss:
Net loss	91		59
Prior service cost (credit)	8		9
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
US Pension and postretirement benefits obligations due to adoption of the 2014 mortality table	13		15
Change in benefit obligations:
Benefit obligations at January 1	279		311
Service cost	3		4
Interest cost	13		12
Plan amendment	(42)	[2]
Actuarial loss	42	[3]	(31)	[3]
Foreign currency exchange rate changes	0		0
Benefits paid	(16)		(17)
Benefit obligations at December 31	279		279
Change in plan assets:
Fair value of plan assets at January 1	0		0
Actual return on plan assets	0		0
Employer contributions	0		0
Foreign currency exchange rate changes	0		0
Benefits paid	(16)		(17)
Fair value of plan assets at December 31	0		0
Funded status of plans at December 31
Funded status of plans at December 31	(279)		(279)
Amounts recognized in the consolidated balance sheet:
Current liabilities	(19)		(19)
Noncurrent liabilities	(260)		(260)
Accrued benefit cost	(279)		(279)
Pretax amounts in accumulated other comprehensive loss:
Net loss	34		(8)
Prior service cost (credit)	$ (41)		$ (5)

[1] Related to the sale of our Norway business in the fourth quarter of 2014.

[2] Represents a change in plan design related to the health care benefits provided under the postretirement plan.

[3] Includes the increase in the U.S. pension and postretirement benefit obligations of $13 million and $15 million respectively, due to the adoption of the 2014 mortality table.