STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY (Cumulative Convertible Perpetual Preferre Stock, Series A) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 30, 2016	Apr. 30, 2009	Dec. 31, 2009	Dec. 31, 2016	Dec. 31, 2017	Dec. 15, 2016
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion	24.2010
Convertible Preferred Stock Term of Conversion Share Price						$ 53.72
Share Price						$ 58.35
Preferred Stock, Value, Outstanding	$ 4,000
Stock Issued During Period, Value, Treasury Stock Reissued Upon Preferred Stock Conversion				$ 0
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, Treasury Stock Reissued	96,800,000
Treasury Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, Treasury Stock Reissued Upon Preferred Stock Conversion				4,695
Additional Paid-in Capital [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, Treasury Stock Reissued Upon Preferred Stock Conversion				$ 695
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Conversion of Stock, Shares Converted	4,000,000
Preferred Stock, Par or Stated Value Per Share					$ 1.00
Preferred Stock, Dividend Rate, Percentage			8.50%
Amount of ongoing dividends per quarter			$ 85
Series A Preferred Stock [Member] | Berkshire Hathaway [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, New Issues		$ 3,000
Stock Issued During Period, Shares, New Issues		3,000,000
Series A Preferred Stock [Member] | Kuwait Investment Authority [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, New Issues		$ 1,000
Stock Issued During Period, Shares, New Issues		1,000,000