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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
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 December 31, 2016
$
(273
)
 
$
14

 
$
8

 
$
(90
)
 
$
(341
)
2017 net change
96

 
—

 
1

 
(1
)
 
96

Balance at June 30, 2017
$
(177
)
 
$
14

 
$
9

 
$
(91
)
 
$
(245
)
Balance at December 31, 2017, before cumulative effect of adjustments
$
(173
)
 
$
16

 
$
11

 
$
(89
)
 
$
(235
)
Cumulative effect of changes in accounting principles, net of tax (c)
 
 
 
 
 
 
 
 
 
Adoption of Accounting Standards Update 2016-01
27

 
—

 
—

 
—

 
27

Adoption of Accounting Standards Update 2018-02
(40
)
 
4

 
—

 
(6
)
 
(42
)
Balance at January 1, 2018, after cumulative effect of adjustments
(186
)
 
20

 
11

 
(95
)
 
(250
)
2018 net change
(412
)
 
(1
)
 
17

 
(2
)
 
(398
)
Balance at June 30, 2018
$
(598
)
 
$
19

 
$
28

 
$
(97
)
 
$
(648
)

(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 18.
(c)
Refer to the section titled Recently Adopted Accounting Standards in Note 1 for additional information.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following tables present the before- and after-tax changes in each component of accumulated other comprehensive (loss) income.
Three months ended June 30, 2018 ($ in millions)
Before tax
 
Tax effect
 
After tax
Investment securities
 
 
 
 
 
Net unrealized losses arising during the period
$
(95
)
 
$
22

 
$
(73
)
Less: Net realized gains reclassified to income from continuing operations
1

(a)
—

(b)
1

Net change
(96
)
 
22

 
(74
)
Translation adjustments
 
 
 
 
 
Net unrealized losses arising during the period
(3
)
 
1

 
(2
)
Net investment hedges (c)
 
 
 
 
 
Net unrealized gains arising during the period
3

 
(1
)
 
2

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 loss
$
(90
)
 
$
20

 
$
(70
)
(a)
Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income.
(b)
Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income.
(c)
For additional information on derivative instruments and hedging activities, refer to Note 18.
Three months ended June 30, 2017 ($ in millions)
Before tax
 
Tax effect
 
After tax
Investment securities
 
 
 
 
 
Net unrealized gains arising during the period
$
132

 
$
(37
)
 
$
95

Less: Net realized gains reclassified to income from continuing operations
23

(a)
(3
)
(b)
20

Net change
109

 
(34
)
 
75

Translation adjustments
 
 
 
 
 
Net unrealized gains arising during the period
4

 
(1
)
 
3

Net investment hedges (c)
 
 
 
 
 
Net unrealized losses arising during the period
(4
)
 
1

 
(3
)
Cash flow hedges (c)
 
 
 
 
 
Net unrealized gains arising during the period
1

 
—

 
1

Other comprehensive income
$
110

 
$
(34
)
 
$
76

(a)
Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income.
(b)
Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income.
(c)
For additional information on derivative instruments and hedging activities, refer to Note 18.
Six months ended June 30, 2018 ($ in millions)
Before tax
 
Tax effect
 
After tax
Investment securities
 
 
 
 
 
Net unrealized losses arising during the period
$
(531
)
 
$
125

 
$
(406
)
Less: Net realized gains reclassified to income from continuing operations
7

(a)
(1
)
(b)
6

Net change
(538
)
 
126

 
(412
)
Translation adjustments
 
 
 
 
 
Net unrealized losses arising during the period
(8
)
 
2

 
(6
)
Net investment hedges (c)
 
 
 
 
 
Net unrealized gains arising during the period
7

 
(2
)
 
5

Cash flow hedges (c)
 
 
 
 
 
Net unrealized gains arising during the period
23

 
(6
)
 
17

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

 
(2
)
Other comprehensive loss
$
(518
)
 
$
120

 
$
(398
)
(a)
Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income.
(b)
Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income.
(c)
For additional information on derivative instruments and hedging activities, refer to Note 18.
Six months ended June 30, 2017 ($ in millions)
Before tax
 
Tax effect
 
After tax
Investment securities
 
 
 
 
 
Net unrealized gains arising during the period
$
183

 
$
(42
)
 
$
141

Less: Net realized gains reclassified to income from continuing operations
50

(a)
(5
)
(b)
45

Net change
133

 
(37
)
 
96

Translation adjustments
 
 
 
 
 
Net unrealized gains arising during the period
6

 
(2
)
 
4

Net investment hedges (c)
 
 
 
 
 
Net unrealized losses arising during the period
(6
)
 
2

 
(4
)
Cash flow hedges (c)
 
 
 
 
 
Net unrealized gains arising during the period
1

 
—

 
1

Defined benefit pension plans
 
 
 
 
 
Net unrealized losses arising during the period
(1
)
 
—

 
(1
)
Other comprehensive income
$
133

 
$
(37
)
 
$
96

(a)
Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income.
(b)
Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income.
(c)
For additional information on derivative instruments and hedging activities, refer to Note 18.