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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 24 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 | Jul. 07, 2011 Posco [Member] | Jul. 07, 2011 CIC [Member] | Jul. 07, 2011 Mong Duong [Member] MW
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | $ 2,057 |  |  |  | $ 1,967 |  |  |  | $ 2,057 | $ 1,967 |  | $ 1,967 |  |  |
Unrealized derivative losses, net | 481 |  |  |  | 534 |  |  |  | 481 | 534 |  | 534 |  |  |
Unfunded pension obligation | (382) |  |  |  | (257) |  |  |  | (382) | (257) |  | (257) |  |  |
Securities available-for-sale | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  | 0 |  |  |
Accumulated other comprehensive loss | 2,920 |  |  |  | 2,758 |  |  |  | 2,920 | 2,758 |  | 2,758 |  |  |
Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Dividends Per Share Declared | $ 0.04 | $ 0.04 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0.08 | $ 0 | $ 0 |  |  |  |
Stock Repurchase Plan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Increase In Authorized Amount |  |  |  |  |  |  |  |  | 300 |  |  |  |  |  |
Acquisition of treasury stock (shares) |  |  |  |  |  |  |  |  |  | 24,790,384 |  | 58,715,189 |  |  |
Treasury Stock Value Acquired Cost Method Excluding Commissions |  |  |  |  |  |  |  |  |  | 301 |  | 680 |  |  |
Treasury Stock Acquired Average Cost Per Share |  |  |  |  |  |  |  |  |  | $ 12.16 |  | $ 11.58 |  |  |
Treasury stock, shares | 66,415,984 |  |  |  | 42,386,961 |  |  |  | 66,415,984 | 42,386,961 |  | 42,386,961 |  |  |
Transfers To From Noncontrolling Interests [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net transfers (to) from noncontrolling interest |  |  |  |  |  |  |  |  | 11 | 19 |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Equity interest sold |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% | 19.00% |
Generation Capacity (MW) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,240
Ownership after all transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00%
Net gain on transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19

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