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Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss
The following tables present the change in each of the components of accumulated other comprehensive income and the related tax effect of the change allocated to each component for the three and six months ended June 30, 2018 and 2017.
(Dollars in millions)
 
Before
Tax
Amount
 
Tax
Effect
 
Net of
Tax
For the Three Months Ended June 30, 2018
 
 
 
 
 

Cash flow hedge activities:
 
 
 
 
 

Unrealized net gains (losses) on hedges arising during the period
 
$
(19
)
 
$
5

 
$
(14
)
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt           
 
8

 
(2
)
 
6

Net change
 
(11
)
 
3

 
(8
)
Securities:
 
 
 
 
 

Unrealized holding gains (losses) arising during the period on securities available for sale
 
(60
)
 
15

 
(45
)
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net
 
(3
)
 
1

 
(2
)
Amortization of net unrealized (gains) losses on held to maturity securities
 
8

 
(2
)
 
6

Net change
 
(55
)
 
14

 
(41
)
Pension and other benefits:
 
 
 
 
 

   Amortization of prior service credit(1)
 
(11
)
 
4

 
(7
)
   Recognized net actuarial (gain) loss(1)
 
24

 
(7
)
 
17

Net change
 
13

 
(3
)
 
10

Net change in AOCI
 
$
(53
)
 
$
14

 
$
(39
)
 
 
(1)
These amounts are included in the computation of net periodic pension cost. For further information, see Note 11.
(Dollars in millions)
 
Before
Tax
Amount
 
Tax
Effect
 
Net of
Tax
For the Three Months Ended June 30, 2017
 
 
 
 
 
 
Cash flow hedge activities:
 
 
 
 
 
 
Unrealized net gains (losses) on hedges arising during the period
 
$
55

 
$
(21
)
 
$
34

Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt           
 
(20
)
 
8

 
(12
)
Net change
 
35

 
(13
)
 
22

Securities:
 
 
 
 
 
 
Unrealized holding gains (losses) arising during the period on securities available for sale
 
41

 
(15
)
 
26

Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net
 
(7
)
 
3

 
(4
)
Amortization of net unrealized (gains) losses on held to maturity securities
 
4

 
(2
)
 
2

Net change
 
38

 
(14
)
 
24

Foreign currency translation adjustment
 
4

 
(2
)
 
2

Pension and other benefits:
 
 
 
 
 
 
     Amortization of prior service credit(1)
 
(12
)
 
4

 
(8
)
     Recognized net actuarial (gain) loss(1)
 
23

 
(9
)
 
14

Net change
 
11

 
(5
)
 
6

Net change in AOCI
 
$
88

 
$
(34
)
 
$
54

 
 

(1)
These amounts are included in the computation of net periodic pension cost. For further information, see Note 11.
Change in Accumulated Other Comprehensive Loss Balances
The following tables present the change in accumulated other comprehensive loss balances.
For the Three Months Ended June 30, 2017 and 2018:
 
 
Net Unrealized
Gains (Losses) on Cash Flow Hedges
 
Net
Unrealized
Gains (Losses)
on Securities
 
Foreign
Currency
Translation
Adjustment
 
Pension and
Other Postretirement
Benefits
Adjustment
 
Other
 
Accumulated
Other
Comprehensive
Loss
(Dollars in millions)
 
 
 
 
 
 
Balance, March 31, 2017
 
$
(107
)
 
$
(173
)
 
$
(21
)
 
$
(582
)
 
$
—

 
$
(883
)
Other comprehensive income (loss) before reclassifications
 
34

 
26

 
2

 
—

 
—

 
62

Amounts reclassified from AOCI
 
(12
)
 
(2
)
 
—

 
6

 
—

 
(8
)
Balance, June 30, 2017
 
$
(85
)
 
$
(149
)
 
$
(19
)
 
$
(576
)
 
$
—

 
$
(829
)
Balance, March 31, 2018
 
$
(232
)
 
$
(423
)
 
$
—

 
$
(590
)
 
$
(1
)
 
$
(1,246
)
Other comprehensive income (loss) before reclassifications
 
(14
)
 
(45
)
 
—

 
—

 
—

 
(59
)
Amounts reclassified from AOCI
 
6

 
4

 
—

 
10

 
—

 
20

Balance, June 30, 2018
 
$
(240
)
 
$
(464
)
 
$
—

 
$
(580
)
 
$
(1
)
 
$
(1,285
)


 
 
 
 
 
 
 
 
 
 
 
 
 
For the Six Months Ended June 30, 2017 and 2018:
 
 
Net Unrealized
Gains (Losses) on Cash Flow Hedges
 
Net
Unrealized
Gains (Losses)
on Securities
 
Foreign
Currency
Translation
Adjustment
 
Pension and
Other Postretirement
Benefits
Adjustment
 
Other
 
Accumulated
Other
Comprehensive
Loss
(Dollars in millions)
 
 
 
 
 
 
Balance, December 31, 2016
 
$
(77
)
 
$
(208
)
 
$
(22
)
 
$
(589
)
 
$
—

 
$
(896
)
Other comprehensive income (loss) before reclassifications
 
22

 
59

 
3

 
—

 
—

 
84

Amounts reclassified from AOCI
 
(30
)
 
—

 
—

 
13

 
—

 
(17
)
Balance, June 30, 2017
 
$
(85
)
 
$
(149
)
 
$
(19
)
 
$
(576
)
 
$
—

 
$
(829
)
Balance, December 31, 2017
 
$
(174
)
 
$
(233
)
 
$
(19
)
 
$
(600
)
 
$
—

 
$
(1,026
)
Other comprehensive income (loss) before reclassifications
 
(72
)
 
(238
)
 
(2
)
 
—

 
(1
)
 
(313
)
Amounts reclassified from AOCI
 
6

 
7

 
—

 
20

 
—

 
33

Transfer to additional paid-in capital(1)
 
—

 
—

 
21

 
—

 
—

 
21

Balance, June 30, 2018
 
$
(240
)
 
$
(464
)
 
$
—

 
$
(580
)
 
$
(1
)
 
$
(1,285
)