Summary of Major Accounting Policies - Goodwill (Details) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) reporting_unit	Mar. 31, 2014 USD ($)	Sep. 30, 2014 reporting_unit	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Goodwill [Line Items]
Goodwill impairment	$ 517			$ 40		$ 517	$ 40	$ 0
Goodwill			$ 2,461			$ 1,764	2,461
Minimum
Goodwill [Line Items]
Finite-lived intangible assets, useful life						5 years
Maximum
Goodwill [Line Items]
Finite-lived intangible assets, useful life						28 years
Valves & Measurement
Goodwill [Line Items]
Number of reporting units within the segment | reporting_unit			2		5
Goodwill impairment						$ 0
Goodwill			$ 311			299	$ 311
CPS
Goodwill [Line Items]
Goodwill impairment		$ 517
Goodwill						$ 52