Subsequent Events (Details) - Credit facility	Jul. 25, 2016 USD ($)	Jul. 25, 2016 AUD	Jul. 01, 2016 USD ($)	Apr. 01, 2016 USD ($)
Revolving credit facility
Subsequent Event [Line Items]
Credit facility borrowing capacity			$ 2,900,000,000.0	$ 2,500,000,000.0
Revolving credit facility | Subsequent event
Subsequent Event [Line Items]
Increase in credit facility	$ 100,000,000
Credit facility borrowing capacity	3,000,000,000.0
Debt maturities January 15, 2021	2,800,000,000
Debt maturities January 15, 2020	150,000,000
Increase in credit facility with conditional revolver commitments	740,000,000
Credit facility borrowing capacity with conditional revolver commitments	$ 3,700,000,000
Term loan credit facility maturing July 2021 | Revolving credit facility | Subsequent event
Subsequent Event [Line Items]
Debt face amount | AUD		AUD 100,000,000
Term loan credit facility maturing July 2021 | Term Loan | Subsequent event
Subsequent Event [Line Items]
Incremental term loans | AUD		175,000,000
Maximum | Term loan credit facility maturing July 2021 | Term Loan | Subsequent event
Subsequent Event [Line Items]
Debt face amount | AUD		AUD 275,000,000