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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
Sep. 30, 2017
Dec. 31, 2016
Class of Stock [Line Items]    
Shares Issued (in shares) 2,241 2,241
Shares Outstanding (in shares) 2,241 2,241
Liquidation Preference $ 2,835 $ 2,835
Carrying Value $ 2,783 $ 2,783
Series A Preferred Stock [Member]    
Class of Stock [Line Items]    
Shares Issued (in shares) 400 400
Shares Outstanding (in shares) 400 400
Liquidation Preference Per Share (USD per share) $ 1,000 $ 1,000
Liquidation Preference $ 400 $ 400
Carrying Value $ 397 $ 397
Series B Preferred Stock [Member]    
Class of Stock [Line Items]    
Shares Issued (in shares) 485 485
Shares Outstanding (in shares) 485 485
Liquidation Preference Per Share (USD per share) $ 1,000 $ 1,000
Liquidation Preference $ 485 $ 485
Carrying Value $ 482 $ 482
Series C Preferred Stock [Member]    
Class of Stock [Line Items]    
Shares Issued (in shares) 600 600
Shares Outstanding (in shares) 600 600
Liquidation Preference Per Share (USD per share) $ 1,000 $ 1,000
Liquidation Preference $ 600 $ 600
Carrying Value $ 585 $ 585
Series D Preferred Stock [Member]    
Class of Stock [Line Items]    
Shares Issued (in shares) 750 750
Shares Outstanding (in shares) 750 750
Liquidation Preference Per Share (USD per share) $ 1,000 $ 1,000
Liquidation Preference $ 750 $ 750
Carrying Value $ 728 $ 728
Series E Preferred Stock [Member]    
Class of Stock [Line Items]    
Shares Issued (in shares) 6 6
Shares Outstanding (in shares) 6 6
Liquidation Preference Per Share (USD per share) $ 100,000 $ 100,000
Liquidation Preference $ 600 $ 600
Carrying Value $ 591 $ 591