Equity - Capped Calls (Details) - Call Option - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Aug. 31, 2017	Sep. 01, 2016	Sep. 03, 2015
Option Indexed to Issuer's Equity [Line Items]
Treasury Stock, Shares Acquired (in shares)	4	2	3
Purchased options
Option Indexed to Issuer's Equity [Line Items]
Underlying Common Shares (in shares)	111
Proceeds received upon settlement of capped calls	$ 125,000,000
Shares received upon settlement of capped calls	4	2	3
Dollar value of shares received upon settlement of capped calls	$ 67,000,000	$ 23,000,000	$ 50,000,000
Purchased options | Minimum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	0
Purchased options | Maximum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	$ 527,000,000
Purchased options | 2032C Notes
Option Indexed to Issuer's Equity [Line Items]
Strike Price (in dollars per share)	$ 9.80
Underlying Common Shares (in shares)	25
Purchased options | 2032C Notes | Minimum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	$ 0
Purchased options | 2032C Notes | Maximum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	$ 147,000,000
Purchased options | 2032C Notes | Weighted Average
Option Indexed to Issuer's Equity [Line Items]
Weighted-Average Cap Price (in dollars per share)	$ 15.69
Purchased options | 2032D Notes
Option Indexed to Issuer's Equity [Line Items]
Strike Price (in dollars per share)	$ 10.16
Underlying Common Shares (in shares)	32
Purchased options | 2032D Notes | Minimum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	$ 0
Purchased options | 2032D Notes | Maximum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	$ 184,000,000
Purchased options | 2032D Notes | Weighted Average
Option Indexed to Issuer's Equity [Line Items]
Weighted-Average Cap Price (in dollars per share)	$ 15.91
Purchased options | 2033E Notes
Option Indexed to Issuer's Equity [Line Items]
Strike Price (in dollars per share)	$ 10.93
Underlying Common Shares (in shares)	27
Purchased options | 2033E Notes | Minimum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	$ 0
Purchased options | 2033E Notes | Maximum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	$ 98,000,000
Purchased options | 2033E Notes | Weighted Average
Option Indexed to Issuer's Equity [Line Items]
Weighted-Average Cap Price (in dollars per share)	$ 14.51
Purchased options | 2033F Notes
Option Indexed to Issuer's Equity [Line Items]
Strike Price (in dollars per share)	$ 10.93
Underlying Common Shares (in shares)	27
Purchased options | 2033F Notes | Minimum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	$ 0
Purchased options | 2033F Notes | Maximum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration	$ 98,000,000
Purchased options | 2033F Notes | Weighted Average
Option Indexed to Issuer's Equity [Line Items]
Weighted-Average Cap Price (in dollars per share)	$ 14.51