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Accumulated other comprehensive income (loss) (Tables)
 12 Months Ended
Aug. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of accumulated other comprehensive income (loss)
The following is a summary of net changes in accumulated other comprehensive income by component and net of tax for fiscal 2018, 2017 and 2016 (in millions):
 
Pension/post-retirement
obligations
 
Unrecognized
gain (loss) on
available-for-
sale
investments
 
Unrealized
gain (loss)
on cash
flow hedges
 
Share of
OCI of
equity
method
investments
 
Cumulative
translation
adjustments
 
Total
Balance at August 31, 2015
$
29

 
$
259

 
$
(40
)
 
$
—

 
$
(462
)
 
$
(214
)
Other comprehensive income (loss) before reclassification adjustments
(303
)
 
(148
)
 
—

 
(1
)
 
(2,279
)
 
(2,731
)
Amounts reclassified from accumulated OCI
—

 
(268
)
 
5

 
—

 
(3
)
 
(266
)
Tax benefit (provision)
62

 
159

 
(2
)
 
—

 
—

 
219

Net other comprehensive income (loss)
(241
)
 
(257
)
 
3

 
(1
)
 
(2,282
)
 
(2,778
)
Balance at August 31, 2016
$
(212
)
 
$
2

 
$
(37
)
 
$
(1
)
 
$
(2,744
)
 
$
(2,992
)
Other comprehensive income (loss) before reclassification adjustments
(34
)
 
(2
)
 
—

 
(1
)
 
(133
)
 
(170
)
Amounts reclassified from accumulated OCI1
109

 
—

 
5

 
—

 
—

 
114

Tax benefit (provision)
(2
)
 
—

 
(1
)
 
—

 
—

 
(3
)
Net other comprehensive income (loss)
73

 
(2
)
 
4

 
(1
)
 
(133
)
 
(59
)
Balance at August 31, 2017
$
(139
)
 
$
—

 
$
(33
)
 
$
(2
)
 
$
(2,877
)
 
$
(3,051
)
Other comprehensive income (loss) before reclassification adjustments
417

 
—

 
—

 
(4
)
 
(207
)
 
206

Amounts reclassified from accumulated OCI1 
(120
)
 
—

 
4

 
11

 
8

 
(97
)
Tax benefit (provision)
(57
)
 
—

 
(1
)
 
(2
)
 
—

 
(60
)
Net other comprehensive income (loss)
240

 
—

 
3

 
5

 
(199
)
 
49

Balance at August 31, 2018
$
101

 
$
—

 
$
(30
)
 
$
3

 
$
(3,076
)
 
$
(3,002
)

1 
Includes amendment to U.S. postretirement healthcare plan resulting in a curtailment gain. See note 13, retirement benefits.