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AOCI
 9 Months Ended
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
AOCI
AOCI

AOCI includes the after-tax change in unrecognized net costs related to defined benefit pension and OPEB plans, and unrealized gains and losses on cash flow hedges and AFS securities.
Three Months Ended September 30, 2018 and 2017
(Dollars in millions)
Pension and OPEB Costs
 
Cash Flow Hedges
 
AFS Securities
 
Other, net
 
Total
AOCI balance, July 1, 2017
$
(743
)
 
$
(128
)
 
$
(187
)
 
$
(15
)
 
$
(1,073
)
OCI before reclassifications, net of tax
1

 
1

 
19

 
2

 
23

Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
11

 
13

 
(2
)
 
—

 
22

Tax effect
4

 
5

 
(1
)
 
—

 
8

Amounts reclassified, net of tax
7

 
8

 
(1
)
 
—

 
14

Total OCI, net of tax
8

 
9

 
18

 
2

 
37

AOCI balance, September 30, 2017
$
(735
)
 
$
(119
)
 
$
(169
)
 
$
(13
)
 
$
(1,036
)
AOCI balance, July 1, 2018
$
(977
)
 
$
12

 
$
(723
)
 
$
(18
)
 
$
(1,706
)
OCI before reclassifications, net of tax
(27
)

20


(162
)
 
1

 
(168
)
Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
19

 
—

 
9

 
—

 
28

Tax effect
4

 
—

 
2

 
—

 
6

Amounts reclassified, net of tax
15

 
—

 
7

 
—

 
22

Total OCI, net of tax
(12
)
 
20

 
(155
)
 
1

 
(146
)
AOCI balance, September 30, 2018
$
(989
)
 
$
32

 
$
(878
)
 
$
(17
)
 
$
(1,852
)
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2018 and 2017
(Dollars in millions)
Pension and OPEB Costs
 
Cash Flow Hedges
 
AFS Securities
 
Other, net
 
Total
AOCI balance, January 1, 2017
$
(764
)
 
$
(92
)
 
$
(259
)
 
$
(17
)
 
$
(1,132
)
OCI before reclassifications, net of tax
—

 
(26
)
 
99

 
4

 
77

Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
46

 
(1
)
 
(15
)
 
—

 
30

Tax effect
17

 
—

 
(6
)
 
—

 
11

Amounts reclassified, net of tax
29

 
(1
)
 
(9
)
 
—

 
19

Total OCI, net of tax
29

 
(27
)
 
90

 
4

 
96

AOCI balance, September 30, 2017
$
(735
)
 
$
(119
)
 
$
(169
)
 
$
(13
)
 
$
(1,036
)
AOCI balance, January 1, 2018
$
(1,004
)
 
$
(92
)
 
$
(356
)
 
$
(15
)
 
$
(1,467
)
OCI before reclassifications, net of tax
(27
)
 
113

 
(544
)
 
(3
)
 
(461
)
Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
55

 
14

 
29

 
1

 
99

Tax effect
13

 
3

 
7

 
—

 
23

Amounts reclassified, net of tax
42

 
11

 
22

 
1

 
76

Total OCI, net of tax
15

 
124

 
(522
)
 
(2
)
 
(385
)
AOCI balance, September 30, 2018
$
(989
)
 
$
32

 
$
(878
)
 
$
(17
)
 
$
(1,852
)
Primary income statement location of amounts reclassified from AOCI
Other expense
 
Net interest income
 
Net interest income
 
Net interest income