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Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Changes in AOCI by Component
Changes in AOCI by component are as follows:
 
Three Months Ended March 31,
($ in millions)
Derivatives
 
Investments
 
Employee
Benefit
Plans
 
Cumulative
Translation
Adjustment
 
Accumulated Other
Comprehensive
Income (Loss)
Balance January 1, 2017, net of taxes
$
338

 
$
(3
)
 
$
(3,206
)
 
$
(2,355
)
 
$
(5,226
)
Other comprehensive income (loss) before reclassification adjustments, pretax
(263
)
 
87

 
(4
)
 
263

 
83

Tax
92

 
(7
)
 
9

 
46

 
140

Other comprehensive income (loss) before reclassification adjustments, net of taxes
(171
)
 
80

 
5

 
309

 
223

Reclassification adjustments, pretax
(95
)
(1) 
(57
)
(2) 
28

(3) 
—

 
(124
)
Tax
34

 
20

 
(7
)
 
—

 
47

Reclassification adjustments, net of taxes
(61
)

(37
)

21


—

 
(77
)
Other comprehensive income (loss), net of taxes
(232
)
 
43

 
26

 
309

 
146

Balance March 31, 2017, net of taxes
$
106

 
$
40

 
$
(3,180
)
 
$
(2,046
)
 
$
(5,080
)
 
 
 
 
 
 
 
 
 
 
Balance January 1, 2018, net of taxes
$
(108
)
 
$
(61
)
 
$
(2,787
)
 
$
(1,954
)
 
$
(4,910
)
Other comprehensive income (loss) before reclassification adjustments, pretax
(181
)
 
(112
)
 
(1
)
 
319

 
25

Tax
38

 
—

 
3

 
(62
)
 
(21
)
Other comprehensive income (loss) before reclassification adjustments, net of taxes
(143
)
 
(112
)
 
2

 
257

 
4

Reclassification adjustments, pretax
92

(1) 
12

(2) 
41

(3) 
—

 
145

Tax
(19
)
 
1

 
(7
)
 
—

 
(25
)
Reclassification adjustments, net of taxes
73


13


34


—

 
120

Other comprehensive income (loss), net of taxes
(70
)
 
(99
)
 
36

 
257

 
124

 
 
 
 
 
 
 
 
 


Reclassification of provisional stranded tax effects (see Note 1)
(23
)
 
1

 
(344
)
 
100

 
(266
)
Adoption of ASU 2016-01 (see Note 1)
—

 
(8
)
 
—

 
—

 
(8
)
 
 
 
 
 
 
 
 
 
 
Balance March 31, 2018, net of taxes
$
(201
)

$
(167
)

$
(3,095
)

$
(1,597
)

$
(5,060
)
(1) 
Relates to foreign currency cash flow hedges that were reclassified from AOCI to Sales.
(2) 
Represents net realized (gains) losses on the sales of available-for-sale investments that were reclassified from AOCI to Other (income) expense, net. In 2017, these amounts included both debt and equity investments; however, upon adoption of ASU 2016-01 in 2018 (see Note 1), these amounts relate only to available-for-sale debt investments.
(3) 
Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 11).