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Pension and Postretirement Benefit Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | $ 1,584 | $ 1,505 |  |
Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 1,513 | 1,454 |  | $ 1,493
Net Asset Value |  | 533 | 745 |  |
Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 71 | 51 |  | $ 40
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 69 | 102 |  |
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 911 | 607 |  |
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 38 | 35 |  |
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 33 | 16 |  |
Equity Securities [Member] | US All Cap [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [1] | 62 | 76 |  |
Equity Securities [Member] | US All Cap [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [1] | 62 | 76 |  |
Equity Securities [Member] | US Large Cap [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 61 | 102 |  |
Equity Securities [Member] | US Large Cap [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net Asset Value |  | 61 | 102 |  |
Equity Securities [Member] | US Small Cap [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 7 | 26 |  |
Equity Securities [Member] | US Small Cap [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 7 | 26 |  |
Equity Securities [Member] | EAFE Composite [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 65 | 119 |  |
Equity Securities [Member] | EAFE Composite [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net Asset Value |  | 65 | 119 |  |
Equity Securities [Member] | Emerging Markets [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 52 | 66 |  |
Equity Securities [Member] | Emerging Markets [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net Asset Value |  | 52 | 66 |  |
Equity Securities [Member] | Emerging Markets [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  |  |  |
Fixed Income Securities [Member] | Emerging Markets [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 82 | 65 |  |
Fixed Income Securities [Member] | Emerging Markets [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net Asset Value |  | 82 | 65 |  |
Fixed Income Securities [Member] | US Bonds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [2] | 61 | 137 |  |
Fixed Income Securities [Member] | US Bonds [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net Asset Value | [2] |  | 70 |  |
Fixed Income Securities [Member] | US Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [2] | 61 | 67 |  |
Fixed Income Securities [Member] | Corporate Bonds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 464 | 419 |  |
Fixed Income Securities [Member] | Corporate Bonds [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net Asset Value |  | 238 | 221 |  |
Fixed Income Securities [Member] | Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 226 | 198 |  |
Fixed Income Securities [Member] | US Treasury Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 281 | 269 |  |
Fixed Income Securities [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 281 | 269 |  |
Fixed Income Securities [Member] | Foreign Government Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 26 | 25 |  |
Fixed Income Securities [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 26 | 25 |  |
Alternative Investment [Member] | Hedge Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [3] |  | 66 |  |
Alternative Investment [Member] | Hedge Funds [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net Asset Value | [3] |  | 66 |  |
Alternative Investment [Member] | Insurance Contracts [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [4] | 33 | 16 |  |
Alternative Investment [Member] | Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [4] | 33 | 16 |  |
Real Estate [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 35 | 36 |  |
Real Estate [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net Asset Value |  | 35 | 36 |  |
Other securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [5] | 1 | 10 |  |
Other securities [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [5] | (10) | 1 |  |
Other securities [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [5] | 11 | 9 |  |
Other securities [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  |  | [5] |
Other securities [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | (10) | 1 |  |
Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 354 | 73 |  |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | UNITED STATES |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 353 | 72 |  |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | $ 1 | $ 1 |  |
[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 high-yield and 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 $(10) at December 31, 2017 and $1 at December 31, 2016.

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