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Accumulated other comprehensive income (loss) (Tables)
 12 Months Ended
Aug. 31, 2019
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 2019, 2018 and 2017 (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, 2016
$
(212
)
 
$
2

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

 
(1
)
 
(133
)
 
(170
)
Amounts reclassified from AOCI1
109

 
—

 
5

 
—

 
—

 
114

Tax benefit (provision)
(2
)
 
—

 
(1
)
 
—

 
—

 
(3
)
Net change in 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 AOCI1
(120
)
 
—

 
4

 
11

 
8

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

 
(1
)
 
(2
)
 
—

 
(60
)
Net change in other comprehensive income (loss)
240

 
—

 
3

 
5

 
(199
)
 
49

Balance at August 31, 2018
$
101

 
$
—

 
$
(30
)
 
$
3

 
$
(3,076
)
 
$
(3,002
)
Other comprehensive income (loss) before reclassification adjustments
(162
)
 
—

 
74

 
(1
)
 
(801
)
 
(889
)
Amounts reclassified from AOCI
(17
)
 
—

 
5

 
—

 
—

 
(12
)
Tax benefit (provision)
30

 
—

 
(19
)
 
—

 
(6
)
 
5

Net change in other comprehensive income (loss)
(149
)
 
—

 
60

 
(1
)
 
(807
)
 
(896
)
Balance at August 31, 2019
$
(48
)
 
$
—

 
$
31

 
$
3

 
$
(3,884
)
 
$
(3,897
)

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