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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jul. 10, 2018
May 09, 2018
May 08, 2018
Apr. 05, 2018
Mar. 15, 2018
Mar. 31, 2018
Mar. 31, 2017
Subsequent Event [Line Items]              
Noncurrent restricted cash and cash equivalents           $ 750  
Cash dividends declared per common share (in dollars per share)         $ 0.035 $ 0.035 $ 0.858
Scenario, Forecast              
Subsequent Event [Line Items]              
Common stock dividends paid (in dollars per share) $ 0.035            
Subsequent Event              
Subsequent Event [Line Items]              
Cash dividends declared per common share (in dollars per share)   $ 0.035          
Common stock dividends paid (in dollars per share)       $ 0.035      
Koch | Mandatorily Redeemable Preferred Stock              
Subsequent Event [Line Items]              
Noncurrent restricted cash and cash equivalents           $ 750  
Koch | Mandatorily Redeemable Preferred Stock | Subsequent Event              
Subsequent Event [Line Items]              
Maximum distribution amount in event of common stock dividend     $ 27