Defined Benefit Postretirement Plans and Defined Contribution Plan (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2015
United States Pension Plans of US Entity, Defined Benefit [Member]
Components of net periodic benefit cost:
Defined Benefit Plan, Service Cost, Continuing Operations	$ 31		$ 33		$ 31
Defined Benefit Plan, Interest Cost, Continuing Operations	35		40		42
Expected return on plan assets	(34)		(43)		(43)
Depreciation, Depletion and Amortization [Abstract]
- prior service cost (credit)	5		6		7
- actuarial loss	29		43		48
Net settlement loss(a)	99	[1]	45	[1]	45	[1]
Net periodic benefit cost(b)	165	[2]	124	[2]	130	[2]
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss (pretax):
Actuarial loss (gain)	149	[3]	(161)	[3]	172	[3]
Amortization of actuarial (loss) gain	(128)		(88)		(93)
Prior service cost	0		0		0
Amortization of prior service credit (cost)	(5)		(6)		(7)
Total recognized in other comprehensive (income) loss	16		(255)		72
Total recognized in net periodic benefit cost and other comprehensive (income) loss	181		(131)		202
Foreign Pension Plans, Defined Benefit [Member]
Components of net periodic benefit cost:
Defined Benefit Plan, Service Cost, Continuing Operations	16		17		15
Defined Benefit Plan, Interest Cost, Continuing Operations	27		23		22
Expected return on plan assets	(32)		(24)		(23)
Depreciation, Depletion and Amortization [Abstract]
- prior service cost (credit)	1		1		1
- actuarial loss	1		4		4
Net settlement loss(a)	0	[1]	0	[1]	0	[1]
Net periodic benefit cost(b)	13	[2]	21	[2]	19	[2]
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss (pretax):
Actuarial loss (gain)	33	[3]	(15)	[3]	14	[3]
Amortization of actuarial (loss) gain	(1)		(4)		(4)
Prior service cost	0		0		1
Amortization of prior service credit (cost)	(1)		(1)		(1)
Total recognized in other comprehensive (income) loss	31		(20)		10
Total recognized in net periodic benefit cost and other comprehensive (income) loss	44		1		29
Other Postretirement Benefit Plans, Defined Benefit [Member]
Components of net periodic benefit cost:
Defined Benefit Plan, Service Cost, Continuing Operations	3		4		4
Defined Benefit Plan, Interest Cost, Continuing Operations	13		12		14
Expected return on plan assets	0		0		0
Depreciation, Depletion and Amortization [Abstract]
- prior service cost (credit)	(6)		(6)		(7)
- actuarial loss	0		0		0
Net settlement loss(a)	0	[1]	0	[1]	0	[1]
Net periodic benefit cost(b)	10	[2]	10	[2]	11	[2]
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss (pretax):
Actuarial loss (gain)	42	[3]	(31)	[3]	7	[3]
Amortization of actuarial (loss) gain	0		0		0
Prior service cost	(42)		0		0
Amortization of prior service credit (cost)	6		6		7
Total recognized in other comprehensive (income) loss	6		(25)		14
Total recognized in net periodic benefit cost and other comprehensive (income) loss	16		(15)		25
Scenario, Forecast [Member] | United States and Foreign Pension Plans Defined Benefit [Member]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Defined Benefit Plan, Amortization of Net Gains (Losses)							27
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)							6
Scenario, Forecast [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Defined Benefit Plan, Amortization of Net Gains (Losses)							1
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)							$ 4

[1] Settlement losses are recorded when lump sum payments from a plan in a period exceed the plan’s total service and interest costs for the period. Such settlements occurred in one or more of our U.S. pension plans in all periods presented.

[2] Net periodic benefit cost reflects a calculated market-related value of plan assets which recognizes changes in fair value over three years.

[3] Includes the impact of the sale of our Norway business in the fourth quarter of 2014.