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Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2016, net of taxes
$
404

 
$
41

 
$
(2,407
)
 
$
(2,186
)
 
$
(4,148
)
Other comprehensive income (loss) before reclassification adjustments, pretax
(167
)
 
54

 
(35
)
 
99

 
(49
)
Tax
58

 
16

 
(1
)
 
22

 
95

Other comprehensive income (loss) before reclassification adjustments, net of taxes
(109
)
 
70

 
(36
)
 
121

 
46

Reclassification adjustments, pretax
(143
)
(1) 
(11
)
(2) 
7

(3) 
—

 
(147
)
Tax
50

 
4

 
1

 
—

 
55

Reclassification adjustments, net of taxes
(93
)

(7
)

8


—

 
(92
)
Other comprehensive income (loss), net of taxes
(202
)
 
63

 
(28
)
 
121

 
(46
)
Balance March 31, 2016, net of taxes
$
202

 
$
104

 
$
(2,435
)
 
$
(2,065
)
 
$
(4,194
)
 
 
 
 
 
 
 
 
 
 
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
)
(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).