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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Comprehensive Income (Loss) Note [Text Block]
Accumulated Other Comprehensive Loss
The following table presents changes, net of tax, in each component of accumulated other comprehensive loss.
($ in millions)
Unrealized (losses) gains on investment securities (a)
 
Translation adjustments and net investment hedges (b)
 
Cash flow hedges (b)
 
Defined benefit pension plans
 
Accumulated other comprehensive loss
Balance at January 1, 2015
$
(21
)
 
$
36

 
$
7

 
$
(88
)
 
$
(66
)
2015 net change
(138
)
 
(27
)
 
1

 
(1
)
 
(165
)
Balance at December 31, 2015
$
(159
)
 
$
9

 
$
8

 
$
(89
)
 
$
(231
)
2016 net change
(114
)
 
5

 
—

 
(1
)
 
(110
)
Balance at December 31, 2016
$
(273
)
 
$
14

 
$
8

 
$
(90
)
 
$
(341
)
2017 net change
100

 
2

 
3

 
1

 
106

Balance at December 31, 2017
$
(173
)
 
$
16

 
$
11

 
$
(89
)
 
$
(235
)

(a)
Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio.
(b)
For additional information on derivative instruments and hedging activities, refer to Note 22.
The following tables present the before- and after-tax changes in each component of accumulated other comprehensive (loss) income.
Year ended December 31, 2017 ($ in millions)
Before tax
 
Tax effect
 
After tax
Investment securities
 
 
 
 
 
Net unrealized gains arising during the period
$
237

 
$
(45
)
 
$
192

Less: Net realized gains reclassified to income from continuing operations
105

(a)
(13
)
(b)
92

Net change
132

 
(32
)
 
100

Translation adjustments
 
 
 
 
 
Net unrealized gains arising during the period
12

 
(4
)
 
8

Net investment hedges (c)
 
 
 
 
 
Net unrealized losses arising during the period
(10
)
 
4

 
(6
)
Cash flow hedges (c)
 
 
 
 
 
Net unrealized gains arising during the period
5

 
(2
)
 
3

Defined benefit pension plans
 
 
 
 
 
Net unrealized gains arising during the period
1

 
—

 
1

Other comprehensive income
$
140

 
$
(34
)
 
$
106

(a)
Includes gains reclassified to other gain on investments, net in our Consolidated Statement of Income.
(b)
Includes amounts reclassified to income tax expense from continuing operations in our Consolidated Statement of Income.
(c)
For additional information on derivative instruments and hedging activities, refer to Note 22.
Year ended December 31, 2016 ($ in millions)
Before tax
 
Tax effect
 
After tax
Investment securities
 
 
 
 
 
Net unrealized gains arising during the period
$
13

 
$
20

 
$
33

Less: Net realized gains reclassified to income from continuing operations
185

(a)
(38
)
(b)
147

Net change
(172
)
 
58

 
(114
)
Translation adjustments
 
 
 
 
 
Net unrealized gains arising during the period
5

 
(2
)
 
3

Less: Net realized losses reclassified to income from discontinued operations, net of tax
(1
)
 
—

 
(1
)
Net change
6

 
(2
)
 
4

Net investment hedges (c)
 
 
 
 
 
Net unrealized gains arising during the period
1

 
—

 
1

Defined benefit pension plans
 
 
 
 
 
Net unrealized losses arising during the period
(5
)
 
2

 
(3
)
Less: Net realized losses reclassified to income from continuing operations
(4
)
(d)
2

(b)
(2
)
Net change
(1
)
 
—

 
(1
)
Other comprehensive loss
$
(166
)
 
$
56

 
$
(110
)
(a)
Includes gains reclassified to other gain on investments, net in our Consolidated Statement of Income.
(b)
Includes amounts reclassified to income tax expense from continuing operations in our Consolidated Statement of Income.
(c)
For additional information on derivative instruments and hedging activities, refer to Note 22.
(d)
Includes gains reclassified to compensation and benefits expense in our Consolidated Statement of Income.
Year ended December 31, 2015 ($ in millions)
Before tax
 
Tax effect
 
After tax
Investment securities
 
 
 
 
 
Net unrealized losses arising during the period
$
(65
)
 
$
26

 
$
(39
)
Less: Net realized gains reclassified to income from continuing operations
155

(a)
(56
)
(b)
99

Net change
(220
)
 
82

 
(138
)
Translation adjustments
 
 
 
 
 
Net unrealized losses arising during the period
(39
)
 
13

 
(26
)
Less: Net realized gains reclassified to income from discontinued operations, net of tax
42

 
(20
)
 
22

Net change
(81
)
 
33

 
(48
)
Net investment hedges (c)
 
 
 
 
 
Net unrealized gains arising during the period
29

 
(11
)
 
18

Less: Net realized losses reclassified to income from discontinued operations, net of tax
(4
)
 
1

 
(3
)
Net change
33

 
(12
)
 
21

Cash flow hedges (c)
 
 
 
 
 
Net unrealized gains arising during the period
2

 
(1
)
 
1

Defined benefit pension plans
 
 
 
 
 
Net unrealized gains (losses) arising during the period
—

 
—

 
—

Less: Net realized gains reclassified to income from continuing operations
1

(d)
—

(b)
1

Net change
(1
)
 
—

 
(1
)
Other comprehensive loss
$
(267
)
 
$
102

 
$
(165
)
(a)
Includes gains reclassified to other gain on investments, net in our Consolidated Statement of Income.
(b)
Includes amounts reclassified to income tax expense from continuing operations in our Consolidated Statement of Income.
(c)
For additional information on derivative instruments and hedging activities, refer to Note 22.
(d)
Includes gains reclassified to compensation and benefits expense in our Consolidated Statement of Income.