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AOCI
 12 Months Ended
Dec. 31, 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.

(Dollars in millions)
Pension and OPEB Costs
 
Cash Flow Hedges
 
AFS Securities
 
Other, net
 
Total
AOCI balance, January 1, 2016
$
(723
)
 
$
(83
)
 
$
(34
)
 
$
(188
)
 
$
(1,028
)
OCI before reclassifications, net of tax
(91
)
 
(16
)
 
(201
)
 
149

 
(159
)
Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
80

 
11

 
(39
)
 
34

 
86

Tax effect
30

 
4

 
(15
)
 
12

 
31

Amounts reclassified, net of tax
50

 
7

 
(24
)
 
22

 
55

Total OCI, net of tax
(41
)
 
(9
)
 
(225
)
 
171

 
(104
)
AOCI balance, December 31, 2016
(764
)
 
(92
)
 
(259
)
 
(17
)
 
(1,132
)
OCI before reclassifications, net of tax
(129
)
 
7

 
(23
)
 
5

 
(140
)
Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
72

 
15

 
(7
)
 
—

 
80

Tax effect
27

 
4

 
(3
)
 
—

 
28

Amounts reclassified, net of tax
45

 
11

 
(4
)
 
—

 
52

Total OCI, net of tax
(84
)
 
18

 
(27
)
 
5

 
(88
)
Reclassification of certain tax effects
(156
)
 
(18
)
 
(70
)
 
(3
)
 
(247
)
AOCI balance, December 31, 2017
(1,004
)
 
(92
)
 
(356
)
 
(15
)
 
(1,467
)
OCI before reclassifications, net of tax
(217
)
 
52

 
(159
)
 
(6
)
 
(330
)
Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
75

 
12

 
20

 
1

 
108

Tax effect
18

 
3

 
5

 
—

 
26

Amounts reclassified, net of tax
57

 
9

 
15

 
1

 
82

Total OCI, net of tax
(160
)
 
61

 
(144
)
 
(5
)
 
(248
)
AOCI balance, December 31, 2018
$
(1,164
)
 
$
(31
)
 
$
(500
)
 
$
(20
)
 
$
(1,715
)
Primary income statement location of amounts reclassified from AOCI
Other expense
 
Net interest income
 
Net interest income
 
Net interest income