v3.3.1.900
Discontinued Operations Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Net proceeds from divestiture of discontinued operations         $ 730 $ 0 $ 0
SDAAC              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
SDAAC Ownership Percentage, Classified as Discontinued Operations         50.00%    
KDAC              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
KDAC Ownership Percentage, Classified as Discontinued Operations         50.00%    
Discontinued Operations, Disposed of by Sale | Thermal Systems              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from divestiture of discontinued operations         $ 670    
Gain (loss) on divestiture of discontinued operations, net of tax   $ 285     $ 271    
Gain (loss) on divestiture of discontinued operations, net of tax, per share         $ 0.95    
Tax effect of gain on divestiture of discontinued operations         $ 52    
Transaction costs         10    
Post-Closing Adjustments         18    
Discontinued Operations, Disposed of by Sale | Thermal Systems | KDAC              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Net proceeds from divestiture of discontinued operations         70    
Gain (loss) on divestiture of discontinued operations, net of tax $ 47       $ (41)    
Gain (loss) on divestiture of discontinued operations, net of tax, per share         $ (0.14)    
Impairment loss on KDAC interest     $ 88        
Fair value of KDAC interest     $ 32        
Discontinued Operations, Held-for-sale or Disposed of by Sale | Thermal Systems              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain (loss) on divestiture of discontinued operations, net of tax         $ 318 $ 0 $ 0
Discontinued Operations, Held-for-sale | Thermal Systems | SDAAC | Scenario, Forecast              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from divestiture of discontinued operations       $ 100      
Other income (expense), net | Discontinued Operations, Disposed of by Sale | Thermal Systems              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Transition Services Agreement Fees         $ 8