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Subsequent Events (Unaudited) (Tables) | 6 Months Ended
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Jun. 30, 2013
Subsequent Events [Abstract] |
Schedule of Subsequent Events [Table Text Block] | A summary of the conversion activity follows (in millions):
|  | 4% |  | 8% |  | 5.75% |
|  | Senior |  | Preferred |  | Preferred |
|  | Notes |  | Stock |  | Stock |
Acquisition-date (June 3, 2013) fair value |  | $ | 237 |  |  | $ | 30 |  |  | $ | 229 |  |
Less July 2013 conversions |  | 26 |  |  | — |  |  | 29 |  |
Less June 2013 conversions |  | 211 |  |  | 29 |  | a | 200 |  | a
Remaining balance at make-whole expiration dates |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |
Royalty trust units issued upon conversions: |  |  |  |  |  |  |
July 2013 conversions |  | 1.8 |  |  | — |  |  | 2.0 |  |
June 2013 conversions |  | 14.5 |  |  | 2.0 |  | a | 13.7 |  | a
Total |  | 16.3 |  |  | 2.0 |  |  | 15.7 |  |
a. | Conversions of preferred stock in June 2013 included cash consideration of $202 million and royalty trust units with a value of $27 million.

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- Definition Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 + Details
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