Income Taxes - Operating Loss Carryforwards (Details 6) $ in Millions	Aug. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 12,136
2018 - 2022
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	4,665
2023 - 2027
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,608
2028 - 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	4,304
2033 - 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,172
Indefinite
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	387
U.S. Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	3,879
U.S. Federal | 2018 - 2022
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
U.S. Federal | 2023 - 2027
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
U.S. Federal | 2028 - 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	3,027
U.S. Federal | 2033 - 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	852
U.S. Federal | Indefinite
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,954
State | 2018 - 2022
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	27
State | 2023 - 2027
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	330
State | 2028 - 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,277
State | 2033 - 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	320
State | Indefinite
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Foreign | Japan
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	4,072
Foreign | Japan | 2018 - 2022
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	3,485
Foreign | Japan | 2023 - 2027
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	587
Foreign | Japan | 2028 - 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Foreign | Japan | 2033 - 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Foreign | Japan | Indefinite
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Foreign | Taiwan
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,500
Foreign | Taiwan | 2018 - 2022
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	473
Foreign | Taiwan | 2023 - 2027
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	685
Foreign | Taiwan | 2028 - 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Foreign | Taiwan | 2033 - 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Foreign | Taiwan | Indefinite
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	342
Foreign | Other Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	731
Foreign | Other Foreign | 2018 - 2022
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	680
Foreign | Other Foreign | 2023 - 2027
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	6
Foreign | Other Foreign | 2028 - 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Foreign | Other Foreign | 2033 - 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Foreign | Other Foreign | Indefinite
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 45