Subsequent Events (Details) ¥ in Billions		9 Months Ended
	Oct. 24, 2018 USD ($) extension	Sep. 30, 2018	Oct. 24, 2018 JPY (¥)	Jan. 15, 2016 USD ($)
Global Revolving Credit Facility 2018 | Subsequent Event Type
Subsequent Event [Line Items]
Credit facility, maximum borrowing capacity	$ 2,350,000,000.00
Number of extension options | extension	2
Debt instrument, extension term	6 months
Credit facility, maximum borrowing capacity, subject to receipt of lender commitments and other conditions	$ 1,250,000,000.00
Global Revolving Credit Facility
Subsequent Event [Line Items]
Credit facility, maximum borrowing capacity				$ 2,000,000,000.0
Yen Revolving Credit Facility | Subsequent Event Type
Subsequent Event [Line Items]
Credit facility, maximum borrowing capacity	296,500,000.0		¥ 33.3
Credit facility, maximum borrowing capacity, subject to receipt of lender commitments and other conditions	831,100,000		¥ 93.3
Unsecured Term Loan, 5 Year, 2023 | Subsequent Event Type
Subsequent Event [Line Items]
Credit facility, maximum borrowing capacity	$ 300,000,000.0
Debt instrument term	5 years
Unsecured Term Loan, 5 Year, 2024 | Subsequent Event Type
Subsequent Event [Line Items]
Credit facility, maximum borrowing capacity	$ 512,000,000
Number of extension options | extension	2
Debt instrument, extension term	6 months
Debt instrument term	5 years
Unsecured Term Loans
Subsequent Event [Line Items]
Credit facility, maximum borrowing capacity				$ 1.55
Eurodollar
Subsequent Event [Line Items]
Interest rate basis spread		100.00%
Base Rate
Subsequent Event [Line Items]
Interest rate basis spread		0.00%