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Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Dividends Payable [Line Items] |
Dividends Declared [Table Text Block] | During the six months ended June 30, 2018, the following dividends were declared or paid:
Equity Type |  | Declaration Date |  | Record Date |  | Payment Date |  | Dividends Per Share |  | Aggregate Payment Amount |
Common Stock |  | February 21, 2018 |  | March 16, 2018 |  | March 30, 2018 |  | $ | 1.05 |  |  | $ | 439 |  | (a)
Common Stock |  | May 17, 2018 |  | June 15, 2018 |  | June 29, 2018 |  | $ | 1.05 |  |  | $ | 438 |  | (a)
6.875% Mandatory Convertible Preferred Stock |  | December 15, 2017 |  | January 15, 2018 |  | February 1, 2018 |  | $ | 17.1875 |  |  | $ | 28 |  |
6.875% Mandatory Convertible Preferred Stock |  | March 19, 2018 |  | April 15, 2018 |  | May 1, 2018 |  | $ | 17.1875 |  |  | $ | 28 |  |
6.875% Mandatory Convertible Preferred Stock |  | June 22, 2018 |  | July 15, 2018 |  | August 1, 2018 |  | $ | 17.1875 |  |  | $ | 28 |  |
(a) | Inclusive of dividends accrued for holders of unvested restricted stock units, which will be paid when and if the restricted stock units vest.

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- Definition Tabular disclosure of information related to dividends declared, including paid and unpaid dividends. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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