Retirement Plans and Other Retiree Benefits (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014
United States Real Estate Fund | Real Estate | Level 3
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		$ 47		$ 41
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period		2		2
Defined Benefit Plan, Actual Return on Plan Assets Still Held		5		4
Defined Benefit Plan, Purchases, Sales, and Settlements		(14)		0
Fair value of plan assets at end of year		40		47
International Pension Benefits [Member]
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		552		558
Fair value of plan assets at end of year		520		552
International Pension Benefits [Member] | Real Estate | Level 3
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		19	[1]	21
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period		0		0
Defined Benefit Plan, Actual Return on Plan Assets Still Held		1		(1)
Defined Benefit Plan, Purchases, Sales, and Settlements		(1)		(1)
Fair value of plan assets at end of year	[1]	19		19
United States Pension Plan of US Entity [Member]
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		1,771		1,736
Fair value of plan assets at end of year		$ 1,624		$ 1,771
Defined Benefit Plan, Plan Assets Purchased/Sold		0		0
Dividends received by plans on the Company's common stock		$ 3		$ 2
United States Pension Plan of US Entity [Member] | Real Estate | Level 3
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	[1]	46
Fair value of plan assets at end of year	[1]	$ 39		$ 46

[1] 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.