Retirement Plans and Other Retiree Benefits (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Percentage Of Fixed Income Portfolio Invested In Us Treasury Or Agency Securities	50.00%		50.00%
Two Thousand Twelve Restructuring Program [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring Reserve, Charges Against Assets	$ 31		$ 44		$ 0
Defined Benefit Plan, Curtailments	0		(91)
Other Restructuring [Member] | Two Thousand Twelve Restructuring Program [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring Reserve, Charges Against Assets	0		0		0
Defined Benefit Plan, Curtailments	0		(91)
One-time Termination Benefits [Member] | Two Thousand Twelve Restructuring Program [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring Reserve, Charges Against Assets	5		17		0
Defined Benefit Plan, Curtailments	0		0
United States Pension Plan of US Entity [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target asset allocation	100.00%
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	1,771		1,736		1,597
Dividends received by plans on the Company's common stock	2		3
Defined Benefit Plan Percentage Of Equity Securities Invested In Employer Securities	7.00%		6.00%
Defined Benefit Plan, Plan Assets, Common Shares Sold	0		1,540,215
United States Pension Plan of US Entity [Member] | Equity securities
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target asset allocation	27.00%
United States Pension Plan of US Entity [Member] | Cash & cash equivalents | Level 1 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	48		97
United States Pension Plan of US Entity [Member] | U.S. common stocks | Level 1 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	130		127
United States Pension Plan of US Entity [Member] | International common stocks | Level 1 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	0		51
United States Pension Plan of US Entity [Member] | Fixed income securities
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target asset allocation	53.00%
United States Pension Plan of US Entity [Member] | Fixed income securities | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	625	[1]	433	[1]
United States Pension Plan of US Entity [Member] | Developed market equity index funds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	352	[2]	359	[2]
United States Pension Plan of US Entity [Member] | Emerging market equity index funds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	32	[2]	33	[2]
United States Pension Plan of US Entity [Member] | Other common stock funds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	118	[2]	123	[2]
United States Pension Plan of US Entity [Member] | Fixed income funds: U.S. or foreign government and agency securities | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	115	[2]	149	[2]
United States Pension Plan of US Entity [Member] | Fixed income funds: investment grade corporate bonds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	168	[2]	203	[2]
United States Pension Plan of US Entity [Member] | Fixed income funds: high yield corporate bonds and other | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	136	[2]	119	[2]
United States Pension Plan of US Entity [Member] | Guaranteed investment contracts | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	1	[3]	2	[3]
United States Pension Plan of US Entity [Member] | Real Estate [Member] | Level 3 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	46	[4]	40	[4]
United States Pension Plan of US Entity [Member] | Real estate and other investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target asset allocation	20.00%
International Pension Benefits [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target asset allocation	100.00%
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	552		558		486
International Pension Benefits [Member] | Equity securities
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target asset allocation	39.00%
International Pension Benefits [Member] | Cash & cash equivalents | Level 1 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	10		23
International Pension Benefits [Member] | U.S. common stocks | Level 1 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	3		0
International Pension Benefits [Member] | International common stocks | Level 1 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	2		0
International Pension Benefits [Member] | Fixed income securities
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target asset allocation	47.00%
International Pension Benefits [Member] | Fixed income securities | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	0	[1]	0	[1]
International Pension Benefits [Member] | Developed market equity index funds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	193	[2]	229	[2]
International Pension Benefits [Member] | Emerging market equity index funds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	8	[2]	9	[2]
International Pension Benefits [Member] | Other common stock funds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	27	[2]	41	[2]
International Pension Benefits [Member] | Fixed income funds: U.S. or foreign government and agency securities | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	107	[2]	73	[2]
International Pension Benefits [Member] | Fixed income funds: investment grade corporate bonds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	75	[2]	71	[2]
International Pension Benefits [Member] | Fixed income funds: high yield corporate bonds and other | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	54	[2]	35	[2]
International Pension Benefits [Member] | Guaranteed investment contracts | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	54	[3]	56	[3]
International Pension Benefits [Member] | Real Estate [Member] | Level 3 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	19	[4]	21	[4]	20
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	0		0
Defined Benefit Plan, Actual Return on Plan Assets Still Held	(1)		0
Defined Benefit Plan, Purchases, Sales, and Settlements	(1)		1
International Pension Benefits [Member] | Real estate and other investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target asset allocation	14.00%
Other Retiree Benefits [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	41		41		37
Other Retiree Benefits [Member] | Cash & cash equivalents | Level 1 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	1		3
Other Retiree Benefits [Member] | U.S. common stocks | Level 1 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	3		3
Other Retiree Benefits [Member] | International common stocks | Level 1 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	0		1
Other Retiree Benefits [Member] | Fixed income securities | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	13	[1]	8	[1]
Other Retiree Benefits [Member] | Developed market equity index funds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	9	[2]	9	[2]
Other Retiree Benefits [Member] | Emerging market equity index funds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	1	[2]	1	[2]
Other Retiree Benefits [Member] | Other common stock funds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	3	[2]	3	[2]
Other Retiree Benefits [Member] | Fixed income funds: U.S. or foreign government and agency securities | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	3	[2]	3	[2]
Other Retiree Benefits [Member] | Fixed income funds: investment grade corporate bonds | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	4	[2]	5	[2]
Other Retiree Benefits [Member] | Fixed income funds: high yield corporate bonds and other | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	3	[2]	4	[2]
Other Retiree Benefits [Member] | Guaranteed investment contracts | Level 2 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	0	[3]	0	[3]
Other Retiree Benefits [Member] | Real Estate [Member] | Level 3 [Member]
Allocation of plan assets and level of valuation input for each major asset category [Abstract]
Total investments at fair value	$ 1	[4]	$ 1	[4]

[1] The fixed income securities are traded over the counter and certain of these securities lack daily pricing or liquidity and as such are classified as Level 2. As of December 31, 2014 and 2013, approximately 50% of the fixed income portfolio was invested in U.S. treasury or agency securities, with the remainder invested in other government bonds and corporate bonds.

[2] Interests in common/collective trust funds are valued using the net asset value (“NAV”) per unit in each fund. The NAV is based on the value of the underlying investments owned by each trust, minus its liabilities, divided by the number of shares outstanding.

[3] The guaranteed investment contracts (“GICs”) represent contracts with insurance companies measured at the cash surrender value of each contract. The Level 2 valuation reflects that the cash surrender value is based principally on a referenced pool of investment funds with active redemption.

[4] 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.