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Equity - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Schedule of Capitalization, Equity [Line Items] |  |
NET INCOME (LOSS) | $ 141 | $ (1,068)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Schedule of Capitalization, Equity [Line Items] |  |
NET INCOME (LOSS) | $ 15 | $ 4
5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member] |  |
Schedule of Capitalization, Equity [Line Items] |  |
Preferred Stock, Dividend Rate, Percentage | 5.00% |
4.50% Cumulative Convertible Preferred Stock [Member] |  |
Schedule of Capitalization, Equity [Line Items] |  |
Preferred Stock, Dividend Rate, Percentage | 4.50% |
5.75% Cumulative Convertible Preferred Stock [Member] |  |
Schedule of Capitalization, Equity [Line Items] |  |
Preferred Stock, Dividend Rate, Percentage | 5.75% |

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