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AOCI (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Changes in AOCI
The following table summarizes activity in AOCI:
(Dollars in millions)
 
Unrecognized Net Pension and Postretirement Costs
 
Unrealized Net Gains (Losses) on Cash Flow Hedges
 
Unrealized Net Gains (Losses) on AFS Securities
 
FDIC's Share of Unrealized (Gains) Losses on AFS Securities
 
Other, net
 
Total
AOCI balance, January 1, 2015
 
$
(626
)
 
$
(54
)
 
$
152

 
$
(207
)
 
$
(16
)
 
$
(751
)
OCI before reclassifications, net of tax
 
(139
)
 
(81
)
 
(206
)
 
19

 
(9
)
 
(416
)
Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
 
 
 
Before tax (1)
 
67

 
83

 
32

 
31

 
9

 
222

Tax effect
 
25

 
31

 
12

 
12

 
3

 
83

Amounts reclassified, net of tax
 
42

 
52

 
20

 
19

 
6

 
139

Total OCI, net of tax
 
(97
)
 
(29
)
 
(186
)
 
38

 
(3
)
 
(277
)
AOCI balance, December 31, 2015
 
(723
)
 
(83
)
 
(34
)
 
(169
)
 
(19
)
 
(1,028
)
OCI before reclassifications, net of tax
 
(91
)
 
(16
)
 
(201
)
 
148

 
1

 
(159
)
Amounts reclassified from AOCI:
 
 

 
 

 
 

 
 

 
 

 
 

Before tax (1)
 
80

 
11

 
(39
)
 
33

 
1

 
86

Tax effect
 
30

 
4

 
(15
)
 
12

 
—

 
31

Amounts reclassified, net of tax
 
50

 
7

 
(24
)
 
21

 
1

 
55

Total OCI, net of tax
 
(41
)
 
(9
)
 
(225
)
 
169

 
2

 
(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 (1)
 
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
)

(1)
Amounts related to unrecognized net pension and postretirement costs are included in personnel expense, amounts related to unrealized net gains (losses) on cash flow hedges are included in net interest income, amounts related to unrealized net gains (losses) on AFS securities are included in net interest income or securities gains/losses when realized, amounts related to FDIC's share of unrealized gains (losses) on AFS securities are included in FDIC loss share income, net and amounts related to other, net are primarily included in net interest income in the Consolidated Statements of Income.