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Stockholders' Equity: Stock buyback program (Details)
 2 Months Ended 12 Months Ended
Feb. 22, 2016
USD ($)
shares
Jan. 29, 2016
$ / shares
Jan. 20, 2016
$ / shares
shares
Nov. 13, 2015
USD ($)
shares
Oct. 30, 2015
dividend
$ / shares
Jan. 20, 2016
shares
Dec. 31, 2015
$ / shares
Sep. 30, 2015
USD ($)
Subsequent events                
Authorized amount for accelerated stock repurchase program       $ 400,000,000        
Accelerated share repurchased, number of shares purchased (shares) | shares       4,140,788        
Authorized amount for stock repurchase program       $ 400,000,000       $ 1,200,000,000
Number of dividends declared | dividend         2      
Dividends declared for common stock | $ / shares         $ 2.00   $ 6.63  
Subsequent Event                
Subsequent events                
Authorized amount for accelerated stock repurchase program $ 400,000,000              
Accelerated share repurchased, number of shares purchased (shares) | shares 4,222,193   970,609     5,111,397    
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share) | $ / shares     $ 78.26          
Authorized amount for stock repurchase program $ 400,000,000              
Dividends declared for common stock | $ / shares   $ 0.68