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Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
4.0% Convertible Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, repayments (in dollars) |  | $ 105 |  |  |  |
Debt instrument, convertible, conversion price per share (in dollars per share) |  | $ 15.76 |  |  |  |
2011 4.0% Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price per share (in dollars per share) |  | 15.76 |  |  |  |
2009 4.0% Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price per share (in dollars per share) |  | $ 15.76 |  |  |  |
4.25% Convertible Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, repayments (in dollars) | $ 97 |  |  |  |  |
Debt instrument, convertible, conversion price per share (in dollars per share) | $ 15.48 |  |  |  |  |
2011 4.25% Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price per share (in dollars per share) | 15.48 |  |  |  |  |
2009 4.25% Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price per share (in dollars per share) | $ 15.48 |  |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Premium shares (in shares) |  |  | 0 | 3,199,000 | 0 | 6,460,000
Convertible Debt [Member] | 2011 4.0% Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Premium shares (in shares) |  |  |  |  |  | 2,400,000
Convertible Debt [Member] | 4.0% Convertible Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, matured and converted (in dollars) |  | $ 115 |  |  |  |
Debt instrument, convertible, interest rate (percentage) |  | 4.00% |  |  |  |
Convertible Debt [Member] | 2011 4.0% Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, matured and converted (in dollars) |  | $ 105 |  |  |  |
Debt instrument, convertible, interest rate (percentage) |  | 4.00% |  |  |  |
Convertible Debt [Member] | 2009 4.0% Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, matured and converted (in dollars) |  | $ 10 |  |  |  |
Debt instrument, convertible, interest rate (percentage) |  | 4.00% |  |  |  |
Convertible Debt [Member] | 4.25% Convertible Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, matured and converted (in dollars) | $ 100 |  |  |  |  |
Debt instrument, convertible, interest rate (percentage) | 4.25% |  |  |  |  |
Convertible Debt [Member] | 2011 4.25% Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, matured and converted (in dollars) | $ 97 |  |  |  |  |
Debt instrument, convertible, interest rate (percentage) | 4.25% |  |  |  |  |
Convertible Debt [Member] | 2009 4.25% Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, matured and converted (in dollars) | $ 3 |  |  |  |  |
Debt instrument, convertible, interest rate (percentage) | 4.25% |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Weighted average anti-dilutive common stock equivalents (in shares) |  |  | 0 | 304,486 | 648,379 | 223,422
Common Stock [Member] | 4.0% Convertible Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, common shares issued (in shares) |  | 4,200,000 |  |  |  |
Common Stock [Member] | 4.25% Convertible Notes [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Debt instrument, convertible, common shares issued (in shares) | 2,400,000 |  |  |  |  |
Common Stock [Member] | Common Stock Equivalents Excluded Due To Net Loss [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Weighted average anti-dilutive common stock equivalents (in shares) |  |  |  |  | 648,379 |

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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or 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 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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