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. | |