Debt - Narrative (Details) - USD ($)	Jun. 30, 2017	Apr. 03, 2017	Mar. 31, 2017
Debt Instrument [Line Items]
Principal amount		$ 1,500,000,000
Term loan | USD term loan due 2020
Debt Instrument [Line Items]
Principal amount		375,000,000
Term loan | USD term loan
Debt Instrument [Line Items]
Principal amount		1,300,000,000
Term loan | EUR term loan
Debt Instrument [Line Items]
Principal amount		$ 315,000,000
Senior notes | Senior notes due 2020
Debt Instrument [Line Items]
Stated interest rate		2.875%
Senior notes | Senior notes due 2025
Debt Instrument [Line Items]
Stated interest rate		4.25%
Senior notes | Senior notes due 2027
Debt Instrument [Line Items]
Stated interest rate		4.75%
Senior notes | Senior notes due 2030 | HPES
Debt Instrument [Line Items]
Principal amount		$ 300,000,000
Stated interest rate		7.45%
Credit facility | Revolving credit facility
Debt Instrument [Line Items]
Commitments outstanding	$ 698,000,000		$ 678,000,000
Credit facility | HPES | Revolving credit facility
Debt Instrument [Line Items]
Commitments outstanding	3,700,000,000
Credit facility | Commitments Due January 2021 | HPES | Revolving credit facility
Debt Instrument [Line Items]
Commitments outstanding	70,000,000
Credit facility | Commitments Due January 2022 | HPES | Revolving credit facility
Debt Instrument [Line Items]
Commitments outstanding	$ 3,600,000,000