Fair Value of Financial Instruments Narrative (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings				$ 14	$ (3)	$ 7
Derivative, Fair Value, Net				12	(37)
Total debt, recorded amount				4,149	3,963
Total debt, fair value				4,289	3,999
Asset Impairment Charges				9	1	7
Net proceeds from divestiture of discontinued operations				0	48	713
Gain (loss) on divestiture of discontinued operations, net of tax	$ 104			0	104	318
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability				33	35
Discontinued Operations, Disposed of by Sale | Thermal Systems
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on divestiture of discontinued operations, net of tax						271
Discontinued Operations, Disposed of by Sale | KDAC | Thermal Systems
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment loss on KDAC interest			$ 88
Fair value of KDAC interest			$ 32
Net proceeds from divestiture of discontinued operations		$ 70
Gain (loss) on divestiture of discontinued operations, net of tax		$ 47				(41)
Cost of Sales | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges				9	1	7
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt, fair value				4,289	3,999
Level 2 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability				0	0
Other Current Liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability				7	22
Other Long-Term Liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability				26	13
Contingent Consideration liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings				14	(3)
Contingent Consideration liability | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability				$ 33	$ 35	$ 32
Contingent Consideration liability | Minimum | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Periods in which milestones are expected to be achieved				2018
Contingent Consideration liability | Maximum | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Periods in which milestones are expected to be achieved				2020