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Accrued Expenses and Other Long-Term Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Accrued Expenses |  |  |
Defined benefit plan liabilities, current |  | $ 40 | $ 48
Wage and other employee-related liabilities, current |  | 292 | 294
Environmental liabilities, current |  | 27 | 26
Accrued interest expense, current |  | 96 | 88
Asset retirement obligations, current |  | 19 | 20
Other accrued liabilities, current |  | 80 | 120
Accrued expenses |  | 554 | 596
Other Long-Term Liabilities |  |  |
Defined benefit plan liabilities, noncurrent |  | 719 | 792
Wage and other employee-related liabilities, noncurrent |  | 100 | 104
Uncertain income tax position (assets) liabilities, including related penalties and interest | [1] | 148 | 316
Environmental liabilities, noncurrent |  | 231 | 269
Asset retirement obligations, noncurrent |  | 64 | 71
Other accrued liabilities, noncurrent |  | 349 | 387
Other long-term liabilities |  | 1,611 | 1,939
Uncertain tax position liabilities |  | 391 | 484
Income Taxes Payable [Member] |  |  |
Other Long-Term Liabilities |  |  |
Uncertain tax position liabilities, current |  | 438 | $ 168
Deferred Charges and Other Assets, net [Member] |  |  |
Other Long-Term Liabilities |  |  |
Uncertain income tax position (assets) liabilities, including related penalties and interest |  | $ (195) |
[1] | As of December 31, 2015, our net liability for uncertain tax positions, including related penalties and interest, was $391 million. Of this amount, $438 million was classified as a current liability and reflected in income taxes payable, and $148 million was classified as a long-term liability and reflected in other long-term liabilities as detailed in this table. These liabilities were reduced by a $195 million receivable classified as a long-term asset and reflected in “deferred charges and other assets, net.” As of December 31, 2014, our total liability for uncertain tax positions, including related penalties and interest, was $484 million, with $168 million classified as a current liability and reflected in income taxes payable and the remaining $316 million classified as a long-term liability and reflected in other long-term liabilities as detailed in this table.

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