Pension and Postretirement Benefit Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 1,533	$ 1,666
Equity Securities [Member] | US All Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	64	76
Equity Securities [Member] | US Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		72	76
Equity Securities [Member] | US Small Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		20	22
Equity Securities [Member] | EAFE Composite [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		132	139
Equity Securities [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		60	78
Fixed Income Securities [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		64	69
Fixed Income Securities [Member] | US Corporate Bonds and US Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	136	132
Fixed Income Securities [Member] | Corporate Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		471	500
Fixed Income Securities [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		264	263
Fixed Income Securities [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		21	25
Alternative Investment [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	75	87
Alternative Investment [Member] | Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[4]	12	10
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		41	50
Other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]	16	(3)
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		85	142
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1,493	1,622		$ 1,649
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		40	44		$ 42
Fair Value, Inputs, Level 1 [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		347	388
Fair Value, Inputs, Level 1 [Member] | United States Pension Plan of US Entity [Member] | Equity Securities [Member] | US All Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	64	76
Fair Value, Inputs, Level 1 [Member] | United States Pension Plan of US Entity [Member] | Equity Securities [Member] | US Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		72	76
Fair Value, Inputs, Level 1 [Member] | United States Pension Plan of US Entity [Member] | Equity Securities [Member] | US Small Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		20	22
Fair Value, Inputs, Level 1 [Member] | United States Pension Plan of US Entity [Member] | Equity Securities [Member] | EAFE Composite [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		132	139
Fair Value, Inputs, Level 1 [Member] | United States Pension Plan of US Entity [Member] | Equity Securities [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 59	$ 75
Fair Value, Inputs, Level 1 [Member] | United States Pension Plan of US Entity [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 1	$ 3
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plan [Member] | Equity Securities [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 1	3
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 1,030	$ 1,097
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Equity Securities [Member] | US Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Equity Securities [Member] | EAFE Composite [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Equity Securities [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Fixed Income Securities [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 64	$ 69
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Fixed Income Securities [Member] | US Corporate Bonds and US Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	136	132
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Fixed Income Securities [Member] | Corporate Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		471	500
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Fixed Income Securities [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 264	$ 263
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Fixed Income Securities [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Alternative Investment [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				[3]
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Alternative Investment [Member] | Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				[4]
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]	$ 11	$ (3)
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Other securities [Member] | Interest Rate Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		11	(3)
Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		84	136
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 27	$ 31
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plan [Member] | Fixed Income Securities [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plan [Member] | Fixed Income Securities [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 21	$ 25
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plan [Member] | Alternative Investment [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				[3]
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plan [Member] | Alternative Investment [Member] | Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				[4]
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plan [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plan [Member] | Other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]	$ 5
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1	$ 6
Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		116	137
Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member] | Alternative Investment [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	$ 75	$ 87
Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member] | Alternative Investment [Member] | Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				[4]
Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 41	$ 50
Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member] | Other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				[5]
Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 12	$ 10
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member] | Alternative Investment [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member] | Alternative Investment [Member] | Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[4]	$ 12	$ 10
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member] | Other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				[5]
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets

[1] This category comprises a combination of small-, mid- and large-cap equity stocks that are allocated at the investment manager's discretion. Investments include common and preferred securities as well as equity funds that invest in these instruments.

[2] This category represents a combination of investment grade corporate bonds, sovereign bonds, Yankee bonds, asset-backed securities and U.S. government bonds. Investments include fixed income funds that invest in these instruments.

[3] This category includes fund managers that invest in a well-diversified group of hedge funds where strategies include, but are not limited to, event driven, relative value, long/short market neutral, multistrategy and global macro. Investments may be made directly or through pooled funds.

[4] This category comprises contracts placed with insurance companies where the underlying assets are invested in fixed interest securities.

[5] Other assets in the U.S. represent interest rate derivatives which had a market value of $11 at December 31, 2015 and $(3) at December 31, 2014.