Retirement Plans and Other Retiree Benefits Additional Disclosures (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Amounts Recognized in Balance Sheet
Current liabilities	$ (89)		$ (94)
Estimated amounts that will be amortized from accumulated other comprehensive income [Abstract]
Expected Benefit Payments From Company Assets	69
Total benefit payments [Abstract]
2015	244
2016	227
2017	238
2018	238
2019	250
2020-2024	1,614
United States Pension Plans of Us Entity And Other Post Retirement Plans [Member] | Real Estate [Member] | Level 3 [Member]
Change in Plan Assets
Fair value of plan assets at beginning of year	41		72
Earned income, net of management expenses	2		2
Unrealized gain on investment	4		9
Purchases, sales, issuances and settlements, net	0		(42)
Fair value of plan assets at end of year	47		41
Funded Status
Fair value of plan assets at end of year	47		41
United States
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Percentage Increase Due To Expected Mortality Update In The Current Year	6.00%
Defined Benefit Plan Percentage Of Equity Securities Invested In Employer Securities	7.00%		6.00%
Defined Benefit Plan, Plan Assets Sold	0		1,540,215
Change in Benefit Obligations
Benefit obligations at beginning of year	2,102		2,227
Service Cost	1		24
Interest cost	102		90		97
Participants' contributions	0		1
Acquisitions/plan amendments	0		40
Actuarial loss (gain)	362		(148)
Foreign exchange impact	0		0
Termination benefits	5	[1]	11	[1]
Curtailments and settlements	0		(12)
Benefit payments	(154)		(131)
Other	(12)		0
Benefit obligations at end of year	2,406		2,102		2,227
Change in Plan Assets
Fair value of plan assets at beginning of year	1,736		1,597
Actual return on plan assets	178		148
Company's benefit plan contributions	23		121
Participants' contributions	0		1
Foreign exchange impact	0		0
Settlements	0		0
Benefit payments	(154)		(131)
Other	(12)		0
Fair value of plan assets at end of year	1,771		1,736		1,597
Funded Status
Benefit obligations at end of year	2,406		2,102		2,227
Fair value of plan assets at end of year	1,771		1,736		1,597
Net amount recognized	(635)		(366)
Amounts Recognized in Balance Sheet
Noncurrent assets	0		16
Current liabilities	(20)		(19)
Noncurrent liabilities	(615)		(363)
Net amount recognized	(635)		(366)
Amounts recognized in Accumulated other comprehensive income consist of
Actuarial loss	933		674
Transition/prior service cost	2		3
Amounts recognized in accumulated other comprehensive income	935		677
Accumulated benefit obligation	2,283		1,995
Weighted-Average Assumptions Used to Determine Benefit Obligations
Discount Rate	4.24%		4.96%
Long-term rate of return on plan assets	6.80%		6.80%
Long-term rate of compensation increase	3.50%		3.50%
ESOP growth rate	0.00%		0.00%
Medical cost trend rate of increase	0.00%		0.00%
Long-term rate of return on plan assets [Abstract]
Average annual rates of return for the most recent 1-year period	11.00%
Average annual rates of return for the most recent 5-year period	10.00%
Average annual rates of return for the most recent 10-year period	7.00%
Average annual rates of return for the most recent 15-year period	5.00%
Average annual rates of return for the most recent 25-year period	8.00%
Components of Net Periodic Benefit Cost
Defined Benefit Plan, Service Cost	1		24		24
Interest cost	102		90		97
Annual ESOP allocation	0		0		0
Expected return on plan assets	(112)		(118)		(112)
Amortization of transition and prior service costs (credits)	1		9		9
Amortization of actuarial loss	37		68		62
Net periodic benefit cost	29		73		80
Other postretirement charges	5		102		0
Total pension cost	34		175		80
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost
Discount Rate	4.96%		4.14%		4.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	6.80%		7.30%		7.75%
Long-term rate of compensation increase	3.50%		3.50%		4.00%
ESOP growth rate	0.00%		0.00%		0.00%
Voluntary contributions to postretirement plans	2		101		101
Total benefit payments [Abstract]
2015	139
2016	139
2017	139
2018	139
2019	140
2020-2024	721
Defined Benefit Plan Dividends Received On Employer Securities	2		3
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	0.00%		0.00%		0.00%
United States | Real Estate [Member] | Level 3 [Member]
Change in Plan Assets
Fair value of plan assets at end of year	46	[2]	40	[2]
Funded Status
Fair value of plan assets at end of year	46	[2]	40	[2]
International Pension Benefits [Member]
Change in Benefit Obligations
Benefit obligations at beginning of year	894		888
Service Cost	17		19
Interest cost	35		34		35
Participants' contributions	4		3
Acquisitions/plan amendments	0		2
Actuarial loss (gain)	123		(1)
Foreign exchange impact	(88)		12
Termination benefits	0	[1]	0	[1]
Curtailments and settlements	(28)		(21)
Benefit payments	(40)		(41)
Other	(1)		(1)
Benefit obligations at end of year	916		894		888
Change in Plan Assets
Fair value of plan assets at beginning of year	558		486
Actual return on plan assets	65		59
Company's benefit plan contributions	36		61
Participants' contributions	4		3
Foreign exchange impact	(43)		2
Settlements	(27)		(11)
Benefit payments	(40)		(41)
Other	(1)		(1)
Fair value of plan assets at end of year	552		558		486
Funded Status
Benefit obligations at end of year	916		894		888
Fair value of plan assets at end of year	552		558		486
Net amount recognized	(364)		(336)
Amounts Recognized in Balance Sheet
Noncurrent assets	6		12
Current liabilities	(28)		(36)
Noncurrent liabilities	(342)		(312)
Net amount recognized	(364)		(336)
Amounts recognized in Accumulated other comprehensive income consist of
Actuarial loss	259		181
Transition/prior service cost	19		23
Amounts recognized in accumulated other comprehensive income	278		204
Accumulated benefit obligation	817		802
Weighted-Average Assumptions Used to Determine Benefit Obligations
Discount Rate	3.06%		3.99%
Long-term rate of return on plan assets	5.05%		5.50%
Long-term rate of compensation increase	2.83%		3.02%
ESOP growth rate	0.00%		0.00%
Medical cost trend rate of increase	0.00%		0.00%
Components of Net Periodic Benefit Cost
Defined Benefit Plan, Service Cost	17		19		12
Interest cost	35		34		35
Annual ESOP allocation	0		0		0
Expected return on plan assets	(29)		(26)		(26)
Amortization of transition and prior service costs (credits)	4		2		2
Amortization of actuarial loss	6		10		9
Net periodic benefit cost	33		39		32
Other postretirement charges	(8)		3		9
Total pension cost	25		42		41
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost
Discount Rate	3.99%		3.57%		4.59%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.50%		5.39%		5.91%
Long-term rate of compensation increase	3.02%		2.80%		2.87%
ESOP growth rate	0.00%		0.00%		0.00%
Total benefit payments [Abstract]
2015	63
2016	45
2017	55
2018	54
2019	64
2020-2024	646
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	0.00%		0.00%		0.00%
International Pension Benefits [Member] | Real Estate [Member] | Level 3 [Member]
Change in Plan Assets
Fair value of plan assets at beginning of year	21	[2]	20
Earned income, net of management expenses	0		0
Unrealized gain on investment	(1)		0
Purchases, sales, issuances and settlements, net	(1)		1
Fair value of plan assets at end of year	19	[2]	21	[2]
Funded Status
Fair value of plan assets at end of year	19	[2]	21	[2]
Pension Benefits [Member]
Benefit Obligation Exceeds Fair Value of Plan Assets
Projected benefit obligation	2,958		1,130
Fair value of plan assets	1,955		402
Accumulated benefit obligation	2,725		700
Fair value of plan assets	1,922		66
Estimated amounts that will be amortized from accumulated other comprehensive income [Abstract]
Net actuarial loss	48
Net transition & prior service cost	11
Other Retiree Benefits [Member]
Change in Benefit Obligations
Benefit obligations at beginning of year	792		875
Service Cost	10		11
Interest cost	42		38		40
Participants' contributions	0		0
Acquisitions/plan amendments	0		0
Actuarial loss (gain)	203		(101)
Foreign exchange impact	(3)		(5)
Termination benefits	0	[1]	6	[1]
Curtailments and settlements	0		0
Benefit payments	(33)		(32)
Other	0		0
Benefit obligations at end of year	1,011		792		875
Change in Plan Assets
Fair value of plan assets at beginning of year	41		37
Actual return on plan assets	4		4
Company's benefit plan contributions	29		32
Participants' contributions	0		0
Foreign exchange impact	0		0
Settlements	0		0
Benefit payments	(33)		(32)
Other	0		0
Fair value of plan assets at end of year	41		41		37
Funded Status
Benefit obligations at end of year	1,011		792		875
Fair value of plan assets at end of year	41		41		37
Net amount recognized	(970)		(751)
Amounts Recognized in Balance Sheet
Noncurrent assets	0		0
Current liabilities	(41)		(39)
Noncurrent liabilities	(929)		(712)
Net amount recognized	(970)		(751)
Amounts recognized in Accumulated other comprehensive income consist of
Actuarial loss	481		296
Transition/prior service cost	(3)		1
Amounts recognized in accumulated other comprehensive income	478		297
Accumulated benefit obligation	0		0
Weighted-Average Assumptions Used to Determine Benefit Obligations
Discount Rate	4.36%		5.24%
Long-term rate of return on plan assets	6.80%		6.80%
Long-term rate of compensation increase	0.00%		0.00%
ESOP growth rate	10.00%		10.00%
Medical cost trend rate of increase	7.00%		7.00%
Assumed medical cost trend rates [Abstract]
Ultimate medical cost trend rate	5.00%
Year which ultimate medical cost trend rate is reached	2021
Effect of a 1% change in the assumed medical cost trend rate [Abstract]
Effect of one percentage point increase on accumulated postretirement benefit obligation	150
Effect of one percentage point decrease on accumulated postretirement benefit obligation	(119)
Effect of one percentage point increase on service and interest cost	11
Effect of one percentage point decrease on service and interest cost	(9)
Components of Net Periodic Benefit Cost
Defined Benefit Plan, Service Cost	11		13		11
Interest cost	42		38		40
Annual ESOP allocation	(1)		(2)		(2)
Expected return on plan assets	(3)		(3)		(3)
Amortization of transition and prior service costs (credits)	3		1		3
Amortization of actuarial loss	16		21		18
Net periodic benefit cost	68		68		67
Other postretirement charges	0		6		1
Total pension cost	68		74		68
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost
Discount Rate	5.24%		4.32%		5.26%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	6.80%		7.30%		7.75%
Long-term rate of compensation increase	0.00%		0.00%		0.00%
ESOP growth rate	10.00%		10.00%		10.00%
Estimated amounts that will be amortized from accumulated other comprehensive income [Abstract]
Net actuarial loss	27
Net transition & prior service cost	3
Total benefit payments [Abstract]
2015	42
2016	43
2017	44
2018	45
2019	46
2020-2024	247
Other Post-Retirement Plan, Benefit Obligation, Percentage Increase Due To Expected Mortality Update In The Current Year	9.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	7.00%		7.50%		8.00%
Other Retiree Benefits [Member] | Real Estate [Member] | Level 3 [Member]
Change in Plan Assets
Fair value of plan assets at end of year	1	[2]	1	[2]
Funded Status
Fair value of plan assets at end of year	1	[2]	1	[2]
Two Thousand Twelve Restructuring Program [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring Reserve, Charges Against Assets	31		44		0
Two Thousand Twelve Restructuring Program [Member] | Other Restructuring [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring Reserve, Charges Against Assets	$ 0		$ 0		$ 0

[1] Represents pension and other retiree benefit enhancements incurred in 2014 and 2013 pursuant to the 2012 Restructuring Program.

[2] Real estate is valued using the NAV per unit of funds that are invested in real estate property. The investment value of the real estate property is determined quarterly using independent market appraisals as determined by the investment manager. Since the appraisals include unobservable inputs, these investments are classified as Level 3. These unobservable inputs may include items such as annual gross rents, projected vacancy rates, collection losses and recovery rates, yield rates, growth assumptions and risk adjusted discount rates.