Discontinued Operations Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 24, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from divestiture of discontinued operations					$ 48	$ 730	$ 0
Gain (loss) on divestiture of discontinued operations, net of tax	$ 104
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%
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%
Thermal Systems | Discontinued Operations, Disposed of by Sale
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
Thermal Systems | Discontinued Operations, Disposed of by Sale | 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
Impairment of KDAC interest, Per Share				$ 0.30
Fair value of KDAC interest				$ 32
Thermal Systems | Discontinued Operations, Disposed of by Sale | SDAAC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from divestiture of discontinued operations					62
Gain (loss) on divestiture of discontinued operations, net of tax					$ 104
Gain (loss) on divestiture of discontinued operations, net of tax, per share					$ 0.38
Tax effect of gain on divestiture of discontinued operations					$ 10
Cash divested					29
Thermal Systems | Discontinued Operations, Disposed of by Sale | Other income (expense), net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition Services Agreement Fees					8	$ 8
Thermal Systems | Discontinued Operations, Held-for-sale or Disposed of by Sale
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					104	318	0
Post-Closing Adjustments to Prior Period Gain on Divestiture					$ (3)	$ 0	$ 0