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AOCI
 6 Months Ended
Jun. 30, 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, April 1, 2018
$
(990
)
 
$
(14
)
 
$
(624
)
 
$
(17
)
 
$
(1,645
)
OCI before reclassifications, net of tax
—

 
23

 
(100
)
 
(2
)
 
(79
)
Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
18

 
3

 
1

 
1

 
23

Tax effect
5

 
—

 
—

 
—

 
5

Amounts reclassified, net of tax
13

 
3

 
1

 
1

 
18

Total OCI, net of tax
13

 
26

 
(99
)
 
(1
)
 
(61
)
AOCI balance, June 30, 2018
$
(977
)
 
$
12

 
$
(723
)
 
$
(18
)
 
$
(1,706
)
AOCI balance, April 1, 2019
$
(1,147
)
 
$
(65
)
 
$
(191
)
 
$
(18
)
 
$
(1,421
)
OCI before reclassifications, net of tax
—


(61
)

346

 
—

 
285

Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
24

 
2

 
(6
)
 
—

 
20

Tax effect
5

 
—

 
(2
)
 
—

 
3

Amounts reclassified, net of tax
19

 
2

 
(4
)
 
—

 
17

Total OCI, net of tax
19

 
(59
)
 
342

 
—

 
302

AOCI balance, June 30, 2019
$
(1,128
)
 
$
(124
)
 
$
151

 
$
(18
)
 
$
(1,119
)
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2019 and 2018
(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
—

 
93

 
(382
)
 
(4
)
 
(293
)
Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
36

 
14

 
20

 
1

 
71

Tax effect
9

 
3

 
5

 
—

 
17

Amounts reclassified, net of tax
27

 
11

 
15

 
1

 
54

Total OCI, net of tax
27

 
104

 
(367
)
 
(3
)
 
(239
)
AOCI balance, June 30, 2018
(977
)
 
12

 
(723
)
 
(18
)
 
(1,706
)
AOCI balance, January 1, 2019
$
(1,164
)
 
$
(31
)
 
$
(500
)
 
$
(20
)
 
$
(1,715
)
OCI before reclassifications, net of tax
—

 
(91
)
 
660

 
2

 
571

Amounts reclassified from AOCI:
 
 
 
 
 
 
 
 
 
Before tax
47

 
(3
)
 
(12
)
 
—

 
32

Tax effect
11

 
(1
)
 
(3
)
 
—

 
7

Amounts reclassified, net of tax
36

 
(2
)
 
(9
)
 
—

 
25

Total OCI, net of tax
36

 
(93
)
 
651

 
2

 
596

AOCI balance, June 30, 2019
$
(1,128
)
 
$
(124
)
 
$
151

 
$
(18
)
 
$
(1,119
)
Primary income statement location of amounts reclassified from AOCI
Other expense
 
Net interest income
 
Net interest income
 
Net interest income