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Subsequent Events (Unaudited) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended | 2 Months Ended |  |  | 1 Months Ended | 2 Months Ended | 6 Months Ended |  | 1 Months Ended | 2 Months Ended | 6 Months Ended |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 03, 2013 | Dec. 31, 2012 | Jul. 31, 2013 5.25% Convertible Senior Notes due 2013 [Member] | Jun. 30, 2013 5.25% Convertible Senior Notes due 2013 [Member] | Jul. 31, 2013 4% Convertible Senior Notes due 2017 [Member] | Jun. 30, 2013 4% Convertible Senior Notes due 2017 [Member] | Jul. 31, 2013 4% Convertible Senior Notes due 2017 [Member] | Jul. 18, 2013 4% Convertible Senior Notes due 2017 [Member] | Jun. 03, 2013 4% Convertible Senior Notes due 2017 [Member] | Jul. 31, 2013 8% Convertible Perpetual Preferred Stock [Member] | Jun. 30, 2013 8% Convertible Perpetual Preferred Stock [Member] | Jul. 31, 2013 8% Convertible Perpetual Preferred Stock [Member] | Jun. 30, 2013 8% Convertible Perpetual Preferred Stock [Member] | Jul. 09, 2013 8% Convertible Perpetual Preferred Stock [Member] | Jul. 31, 2013 5.75% Convertible Perpetual Preferred Stock, Series 1 [Member] | Jun. 30, 2013 5.75% Convertible Perpetual Preferred Stock, Series 1 [Member] | Jul. 31, 2013 5.75% Convertible Perpetual Preferred Stock, Series 1 [Member] | Jun. 30, 2013 5.75% Convertible Perpetual Preferred Stock, Series 1 [Member] | Jul. 09, 2013 5.75% Convertible Perpetual Preferred Stock, Series 1 [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.30% |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Expiration or Due Date |  |  |  |  |  |  |  | Jul. 18, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  | 5.75% |
Preferred Stock Conversion, Converted Instrument, Expiration or Due Date |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 09, 2013 |  |  |  |  |  | Jul. 09, 2013 |  |  |  |
Convertible Debt, Fair Value |  |  |  |  |  |  |  |  |  | $ 0 | $ 237 |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  | 1.0 |  | 26.0 | 211.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Equity, Fair Value | 782 |  |  | 0 |  |  |  |  |  |  |  |  | 30 |  |  | 30 | 1 |  | 229 |  |  | 229 | 0
Conversion of Stock, Amount Converted |  |  |  |  |  |  |  |  |  |  |  | 0 | 29 | [1] |  |  |  | 29 | 200 | [1] |  |  |
Royalty Trust Units Issued, Conversion of Debt or Equity Instrument |  |  |  |  |  |  | 1,800,000 | 14,500,000 | 16,300,000 |  |  | 0 | 2,000,000 | [1] | 2,000,000 |  |  | 2,000,000 | 13,700,000 | [1] | 15,700,000 |  |
Payments for Repurchase of Preferred Stock and Preference Stock | 202 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Trust Units, Fair Value Disclosure |  |  | $ 27 |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
[1] | 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 Expiration, mandatory redemption, or due date, in CCYY-MM-DD format, of the financial instrument issued in exchange for the original preferred stock being converted in a noncash or part noncash transaction. + References No definition available. + Details
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- Definition The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- Definition Expiration, mandatory redemption, or due date, in CCYY-MM-DD format, of the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The cash outflow to reacquire preferred stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The aggregate amount to be paid by the entity upon redemption of the security that is classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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