Borrowings - Loan Agreements and Other Borrowings (Details)				6 Months Ended
	Feb. 22, 2017 USD ($) tranche	Feb. 01, 2017 USD ($)	Dec. 18, 2015 USD ($)	Feb. 29, 2016 USD ($)	Feb. 28, 2017 USD ($)	Jan. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)	Aug. 30, 2016 USD ($)
Line of Credit Facility [Line Items]
Balance outstanding					$ 0
Term Loan | Bridge Credit Agreement
Line of Credit Facility [Line Items]
Term of credit agreement			364 days
Senior unsecured bridge facility			$ 7,800,000,000
Term Loan | 2015 Term Loan Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 5,000,000,000.0
Term Loan | 2016 Term Loan Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity								$ 1,000,000,000.0
Term Loan | Backstop Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity						$ 5,000,000,000.0
Term Loan | Syndicated Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 4,800,000,000.0
Number of tranches | tranche	2
Maximum amount per tranche	$ 2,400,000,000
Maximum additional commitment	450,000,000
Term Loan | Sumitomo Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity	1,000,000,000.0
Reduced commitment amount after issuance of notes	$ 0
Number of tranches | tranche	2
Maximum amount per tranche	$ 500,000,000
Letter of Credit | Backstop Commitment Letter
Line of Credit Facility [Line Items]
Maximum borrowing capacity						$ 5,000,000,000.0
Revolving Credit Facility | 2017 Revolving Credit Agreement
Line of Credit Facility [Line Items]
Term of credit agreement		364 days
Maximum borrowing capacity		$ 1,000,000,000.0
Balance outstanding					0
Commercial Paper
Line of Credit Facility [Line Items]
Balance outstanding					$ 0		$ 0
Average daily short-term borrowings				$ 20,000,000
Weighted-average interest rate				0.62%
Term Loan | Maximum
Line of Credit Facility [Line Items]
Debt to total capitalization ratio					0.60