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Equity - Preferred Stock and Dividends (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock, shares outstanding, beginning of period (in shares) | 5,563,458 |  |
Preferred stock, shares outstanding, end of period (in shares) | 5,563,458 | 5,563,458 |
Loss on exchange of preferred stock | $ 0 | $ 17 | $ 0
5.75% cumulative convertible preferred stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock, shares outstanding, beginning of period (in shares) | 770,000 | 770,000 | 770,000
Preferred stock, shares outstanding, end of period (in shares) | 770,000 | 770,000 | 770,000
Preferred stock, dividend rate | 5.75% |  |
5.75% cumulative convertible preferred stock series A |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock, shares outstanding, beginning of period (in shares) | 423,000 | 463,000 | 463,000
Preferred stock, shares outstanding, end of period (in shares) | 423,000 | 423,000 | 463,000
Preferred stock, dividend rate | 5.75% |  |
4.50% cumulative convertible preferred stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock, shares outstanding, beginning of period (in shares) | 2,559,000 | 2,559,000 | 2,559,000
Preferred stock, shares outstanding, end of period (in shares) | 2,559,000 | 2,559,000 | 2,559,000
Preferred stock, dividend rate | 4.50% |  |
5.00% cumulative convertible preferred stock series 2005 B |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock, shares outstanding, beginning of period (in shares) | 1,811,000 | 1,811,000 | 1,811,000
Preferred stock, shares outstanding, end of period (in shares) | 1,811,000 | 1,811,000 | 1,811,000
Preferred stock, dividend rate | 5.00% |  |
Preferred stock | Preferred stock, exchanged for shares of common stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock exchanges (in shares) | (100) | (40,000) | 0
Preferred stock | 5.75% cumulative convertible preferred stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock exchanges (in shares) |  | 0 |
Preferred stock | 5.75% cumulative convertible preferred stock series A |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock exchanges (in shares) |  | (40,000) |
Stock issued, conversion (in shares) |  | 40,000 |
Interest rate, stated percentage |  | 5.75% |
Preferred stock | 4.50% cumulative convertible preferred stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock exchanges (in shares) |  | 0 |
Preferred stock | 5.00% cumulative convertible preferred stock series 2005 B |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Preferred stock exchanges (in shares) |  | 0 |
Common Stock | Preferred stock, exchanged for shares of common stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Stock issued, conversion (in shares) | 0 | 51,839 | 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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