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Debt, Accounts Receivable Sales Facility and Capitalized Interest (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jul. 31, 2012 | Jun. 30, 2012
Accounts Receivable Sales Facility |  |  |  |  |
Proceeds from the sale of receivables | $ 1,500,000,000 | $ 150,000,000 | $ 1,225,000,000 |  |
Repayments | (1,650,000,000) | 0 | (1,325,000,000) |  |
Capitalized Interest (Textual) |  |  |  |  |
Interest costs incurred, capitalized | 221,000,000 | 152,000,000 | 90,000,000 |  |
Other Debt [Member] |  |  |  |  |
Accounts Receivable Sales Facility |  |  |  |  |
Balance as of beginning of year | 250,000,000 | 100,000,000 | 200,000,000 |  |
Proceeds from the sale of receivables | 1,500,000,000 | 150,000,000 | 1,225,000,000 |  |
Repayments | (1,650,000,000) | 0 | (1,325,000,000) |  |
Balance as of end of year | 100,000,000 | 250,000,000 | 100,000,000 |  |
Accounts Receivable Sales Facility (Textual) |  |  |  |  |
Maximum eligible trade receivables |  |  |  | 1,500,000,000 | 1,000,000,000
Extended term of accounts receivable sales facility | July 2013 |  |  |  |
Designated pool of accounts receivable | $ 3,200,000,000 | $ 3,300,000,000 |  |  |

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