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Debt, Accounts Receivable Sales Facility and Capitalized Interest (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Capitalized Interest (Textual) |  |  |  |  |  |
Interest costs incurred, capitalized |  | $ 16,000,000 | $ 18,000,000 | $ 32,000,000 | $ 35,000,000 |
Credit Facilities [Member] | A/R Sales Facility [Member] |  |  |  |  |  |
Accounts Receivable Sales Facility (Textual) |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 1,500,000,000 |  | 1,500,000,000 |  |
Amount outstanding |  | $ 100,000,000 |  | $ 100,000,000 |  | $ 100,000,000
Credit Facilities [Member] | A/R Sales Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |
Accounts Receivable Sales Facility (Textual) |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 1,400,000,000 |  |  |  |  |
Maturity date of accounts receivable sales facility | Jul. 31, 2016 |  |  |  |  |

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