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Accumulated other comprehensive income (loss)
 12 Months Ended
Aug. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive income (loss)
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 2017, 2016 and 2015 (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, 2014
$
15

$
107

$
(27
)
$
(113
)
$
154

$
136

Other comprehensive income (loss) before reclassification adjustments
23

247

(14
)
(57
)
(779
)
(580
)
Amounts reclassified from accumulated OCI
—

—

(5
)
230

80

305

Tax benefit (provision)
(9
)
(95
)
6

(60
)
83

(75
)
Net other comprehensive income (loss)
14

152

(13
)
113

(616
)
(350
)
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
)
1 
Includes amendment to U.S. postretirement healthcare plan resulting in a curtailment gain. See note 14, retirement benefits.