| **Indebtedness - Schedule of Debt, Net of Unamortized Discount and Debt Issuance Cost (Details) - USD ($) $ in Millions** | Dec. 31, 2016 | Dec. 31, 2015 |
|---------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Debt Instrument**                                                                                                       |          |          |
| Total debt                                                                                                                | $ 3,018       | $ 4,041       |
| Less: short-term debt and current portion of long-term debt                                                               | 132           | 151           |
| Total long-term debt                                                                                                      | 2,886         | 3,890         |
| 6.0% Notes due June 2018                                                                                                  |          |          |
| **Debt Instrument**                                                                                                       |          |          |
| Total debt                                                                                                                | $ 199         | 255           |
| Stated interest rate (percent)                                                                                            | 6.00%         |          |
| 7.5% Senior Notes due November 2018                                                                                       |          |          |
| **Debt Instrument**                                                                                                       |          |          |
| Total debt                                                                                                                | $ 524         | 747           |
| Stated interest rate (percent)                                                                                            | 7.50%         |          |
| 3.2% Senior Notes due August 2021                                                                                         |          |          |
| **Debt Instrument**                                                                                                       |          |          |
| Total debt                                                                                                                | $ 511         | 746           |
| Stated interest rate (percent)                                                                                            | 3.20%         |          |
| 8.55% Debentures due June 2024                                                                                            |          |          |
| **Debt Instrument**                                                                                                       |          |          |
| Total debt                                                                                                                | $ 112         | 149           |
| Stated interest rate (percent)                                                                                            | 8.55%         |          |
| 6.875% Notes due January 2029                                                                                             |          |          |
| **Debt Instrument**                                                                                                       |          |          |
| Total debt                                                                                                                | $ 301         | 394           |
| Stated interest rate (percent)                                                                                            | 6.875%        |          |
| 5.125% Notes due September 2040                                                                                           |          |          |
| **Debt Instrument**                                                                                                       |          |          |
| Total debt                                                                                                                | $ 1,132       | 1,482         |
| Stated interest rate (percent)                                                                                            | 5.125%        |          |
| Other debt                                                                                                                |          |          |
| **Debt Instrument**                                                                                                       |          |          |
| Total debt                                                                                                                | $ 239         | $ 268         |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| X                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details**Name:**us-gaap_DebtInstrumentLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the aggregate of total long-term debt, including current maturities and short-term debt.
+ References
No definition available.
+ Details**Name:**us-gaap_DebtLongtermAndShorttermCombinedAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.
+ References
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| X                                                                                                                                                                                |
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| X                                                                                                                                                                                            |
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| X                                                                                                                                                                                       |
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| X                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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