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Equity - Preferred Stock Table (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 5,839,506 |
Preferred stock, shares outstanding, end of period | 5,603,458 |
Loss on exchange of preferred stock | $ (41) | $ 0
5.75% Cumulative Convertible Preferred Stock [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Preferred Stock, Dividend Rate, Percentage | 5.75% |
5.75% Cumulative Convertible Preferred Stock Series A [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Preferred Stock, Dividend Rate, Percentage | 5.75% |
4.50% Cumulative Convertible Preferred Stock [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Preferred Stock, Dividend Rate, Percentage | 4.50% |
5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Preferred Stock, Dividend Rate, Percentage | 5.00% |
Preferred Stock [Member] | 5.75% Cumulative Convertible Preferred Stock [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 843,000 | 1,497,000
Conversion of Stock, Shares Converted | (72,600) | (24,601)
Preferred stock, shares outstanding, end of period | 770,000 | 1,472,000
Preferred Stock, Dividend Rate, Percentage | 5.75% |
Preferred Stock [Member] | 5.75% Cumulative Convertible Preferred Stock Series A [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 476,000 | 1,100,000
Conversion of Stock, Shares Converted | (12,500) | (1,201)
Preferred stock, shares outstanding, end of period | 463,000 | 1,099,000
Preferred Stock, Dividend Rate, Percentage | 5.75% |
Preferred Stock [Member] | 4.50% Cumulative Convertible Preferred Stock [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 2,559,000 | 2,559,000
Conversion of Stock, Shares Converted | 0 | 0
Preferred stock, shares outstanding, end of period | 2,559,000 | 2,559,000
Preferred Stock [Member] | 5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 1,962,000 | 2,096,000
Conversion of Stock, Shares Converted | (150,948) | 0
Preferred stock, shares outstanding, end of period | 1,811,000 | 2,096,000
Common Stock [Member] | 5.75% Cumulative Convertible Preferred Stock [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 7,442,156 | 975,488
Common Stock [Member] | 5.75% Cumulative Convertible Preferred Stock Series A [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 1,205,923 | 46,018
Common Stock [Member] | 5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 1,317,756 |

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- Definition The number of shares 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 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: 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 + Details
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- Definition The excess of (1) the fair value of all securities and other consideration transferred in transactions by the registrant to the holders of the convertible preferred stock over (2) the fair value of securities issuable pursuant to the original conversion terms, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695 + Details
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