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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 |  |

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