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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Changes in AOCI by Component
Changes in AOCI by component are as follows:
 
Three Months Ended September 30,
($ in millions)
Derivatives
 
Investments
 
Employee
Benefit
Plans
 
Cumulative
Translation
Adjustment
 
Accumulated Other
Comprehensive
Income (Loss)
Balance July 1, 2016, net of taxes
$
111

 
$
167

 
$
(2,543
)
 
$
(1,821
)
 
$
(4,086
)
Other comprehensive income (loss) before reclassification adjustments, pretax
(69
)
 
(22
)
 
(177
)
 
70

 
(198
)
Tax
24

 
(3
)
 
21

 
12

 
54

Other comprehensive income (loss) before reclassification adjustments, net of taxes
(45
)
 
(25
)
 
(156
)
 
82

 
(144
)
Reclassification adjustments, pretax
(45
)
(1) 
(5
)
(2) 
11

(3) 
—

 
(39
)
Tax
16

 
—

 
1

 
—

 
17

Reclassification adjustments, net of taxes
(29
)

(5
)

12


—

 
(22
)
Other comprehensive income (loss), net of taxes
(74
)
 
(30
)
 
(144
)
 
82

 
(166
)
Balance September 30, 2016, net of taxes
$
37

 
$
137

 
$
(2,687
)
 
$
(1,739
)
 
$
(4,252
)
 
 
 
 
 
 
 
 
 
 
Balance July 1, 2017, net of taxes
$
(37
)
 
$
75

 
$
(3,133
)
 
$
(1,999
)
 
$
(5,094
)
Other comprehensive income (loss) before reclassification adjustments, pretax
(88
)
 
170

 
2

 
23

 
107

Tax
31

 
(19
)
 
(13
)
 
44

 
43

Other comprehensive income (loss) before reclassification adjustments, net of taxes
(57
)
 
151

 
(11
)
 
67

 
150

Reclassification adjustments, pretax
(14
)
(1) 
(24
)
(2) 
31

(3) 
—

 
(7
)
Tax
5

 
8

 
(7
)
 
—

 
6

Reclassification adjustments, net of taxes
(9
)

(16
)

24


—

 
(1
)
Other comprehensive income (loss), net of taxes
(66
)
 
135

 
13

 
67

 
149

Balance September 30, 2017, net of taxes
$
(103
)
 
$
210

 
$
(3,120
)
 
$
(1,932
)
 
$
(4,945
)

 
Nine Months Ended September 30,
($ in millions)
Derivatives
 
Investments
 
Employee
Benefit
Plans
 
Cumulative
Translation
Adjustment
 
Accumulated Other
Comprehensive
Income (Loss)
Balance January 1, 2016, net of taxes
$
404

 
$
41

 
$
(2,407
)
 
$
(2,186
)
 
$
(4,148
)
Other comprehensive income (loss) before reclassification adjustments, pretax
(311
)
 
108

 
(395
)
 
424

 
(174
)
Tax
109

 
8

 
88

 
23

 
228

Other comprehensive income (loss) before reclassification adjustments, net of taxes
(202
)
 
116

 
(307
)
 
447

 
54

Reclassification adjustments, pretax
(254
)
(1) 
(26
)
(2) 
25

(3) 
—

 
(255
)
Tax
89

 
6

 
2

 
—

 
97

Reclassification adjustments, net of taxes
(165
)
 
(20
)
 
27

 
—

 
(158
)
Other comprehensive income (loss), net of taxes
(367
)
 
96

 
(280
)
 
447

 
(104
)
Balance September 30, 2016, net of taxes
$
37

 
$
137

 
$
(2,687
)
 
$
(1,739
)
 
$
(4,252
)
 
 
 
 
 
 
 
 
 
 
Balance January 1, 2017, net of taxes
$
338

 
$
(3
)
 
$
(3,206
)
 
$
(2,355
)
 
$
(5,226
)
Other comprehensive income (loss) before reclassification adjustments, pretax
(520
)
 
283

 
27

 
261

 
51

Tax
182

 
(23
)
 
(7
)
 
162

 
314

Other comprehensive income (loss) before reclassification adjustments, net of taxes
(338
)
 
260

 
20

 
423

 
365

Reclassification adjustments, pretax
(159
)
(1) 
(73
)
(2) 
86

(3) 
—

 
(146
)
Tax
56

 
26

 
(20
)
 
—

 
62

Reclassification adjustments, net of taxes
(103
)
 
(47
)
 
66

 
—

 
(84
)
Other comprehensive income (loss), net of taxes
(441
)
 
213

 
86

 
423

 
281

Balance September 30, 2017, net of taxes
$
(103
)
 
$
210

 
$
(3,120
)
 
$
(1,932
)
 
$
(4,945
)

(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.
(3) 
Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 10).