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AOCI
 3 Months Ended
Mar. 31, 2019
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
(Dollars in millions)
Pension and OPEB Costs
 
Cash Flow Hedges
 
AFS Securities
 
Other, net
 
Total
AOCI balance, January 1, 2018
$
(1,004
)
 
$
(92
)
 
$
(356
)
 
$
(15
)
 
$
(1,467
)
OCI before reclassifications, net of tax
—

 
70

 
(282
)
 
(2
)
 
(214
)
Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
18

 
11

 
19

 
—

 
48

Tax effect
4

 
3

 
5

 
—

 
12

Amounts reclassified, net of tax
14

 
8

 
14

 
—

 
36

Total OCI, net of tax
14

 
78

 
(268
)
 
(2
)
 
(178
)
AOCI balance, March 31, 2018
$
(990
)
 
$
(14
)
 
$
(624
)
 
$
(17
)
 
$
(1,645
)
AOCI balance, January 1, 2019
$
(1,164
)
 
$
(31
)
 
$
(500
)
 
$
(20
)
 
$
(1,715
)
OCI before reclassifications, net of tax
—


(30
)

314

 
2

 
286

Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
23

 
(5
)
 
(6
)
 
—

 
12

Tax effect
6

 
(1
)
 
(1
)
 
—

 
4

Amounts reclassified, net of tax
17

 
(4
)
 
(5
)
 
—

 
8

Total OCI, net of tax
17

 
(34
)
 
309

 
2

 
294

AOCI balance, March 31, 2019
$
(1,147
)
 
$
(65
)
 
$
(191
)
 
$
(18
)
 
$
(1,421
)
Primary income statement location of amounts reclassified from AOCI
Other expense
 
Net interest income
 
Net interest income
 
Net interest income