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Stockholder's Equity (Tables)
12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Share Repurchase Activity [Table Text Block]
The Company’s share repurchase activity was as follows for the years ended December 31:
 
2018
 
2017
 
2016
 
Shares
 
Amount
 
Shares
 
Amount
 
Shares
 
Amount
 
(in millions)
Open-market share repurchases
4

 
$
275

 

 
$

 
8

 
$
440

ASRs
12

 
900

 
28

 
1,800

 

 

Share repurchases in connection with stock-based compensation plans
1

 
86

 
1

 
89

 
1

 
72

 
17

 
$
1,261

 
29

 
$
1,889

 
9

 
$
512

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in "Accumulated other comprehensive income (loss)" by component were as follows for the year ended December 31, 2018:
 
2018
 
Before Tax
Amount
 
Tax
Effect
 
Net of Tax
Amount
 
(in millions)
Foreign currency translation adjustments:
 
 
 
 
 
Beginning balance
$
(38
)
 
$

 
$
(38
)
Change in foreign currency translation adjustments
(70
)
 
5

 
(65
)
Ending balance
$
(108
)
 
$
5

 
$
(103
)
Unrealized (losses) on available-for-sale investment securities:
 
 
 
 
 
Beginning balance
$
(11
)
 
$
4

 
$
(7
)
Cumulative effect of change in accounting principle (1)

 
(1
)
 
(1
)
Net unrealized losses arising during the period
(5
)
 
2

 
(3
)
Reclassification of net losses to Other, net
4

 
(1
)
 
3

Net change
(1
)
 

 
(1
)
Ending balance
$
(12
)
 
$
4

 
$
(8
)
Unrealized gains (losses) on cash flow hedges:
 
 
 
 
 
Beginning balance
$
154

 
$
(39
)
 
$
115

Unrealized (losses) arising during the period
(87
)
 
23

 
(64
)
Reclassifications of net (gains) to:
 
 
 
 
 
Cost of revenues
(61
)
 
15

 
(46
)
Selling, general and administrative expenses
(10
)
 
2

 
(8
)
Net change
(158
)
 
40

 
(118
)
Ending balance
$
(4
)
 
$
1

 
$
(3
)
Accumulated other comprehensive income (loss):
 
 
 
 
 
Beginning balance
$
105

 
$
(35
)
 
$
70

Other comprehensive income (loss)
(229
)
 
45

 
(184
)
Ending balance
$
(124
)
 
$
10

 
$
(114
)
            
(1)
Reflects the adoption of accounting standards as described in Note 1.

Changes in "Accumulated other comprehensive income (loss)" by component were as follows for the years ended December 31, 2017 and 2016:
 
2017
 
2016
 
Before Tax
Amount
 
Tax
Effect
 
Net of Tax
Amount
 
Before Tax
Amount
 
Tax
Effect
 
Net of Tax
Amount
 
(in millions)
Foreign currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
(149
)
 
$

 
$
(149
)
 
$
(90
)
 
$

 
$
(90
)
Change in foreign currency translation adjustments
111

 

 
111

 
(59
)
 

 
(59
)
Ending balance
$
(38
)
 
$

 
$
(38
)
 
$
(149
)
 
$

 
$
(149
)
Unrealized (losses) on available-for-sale investment securities:
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
(6
)
 
$
2

 
$
(4
)
 
$
(7
)
 
$
3

 
$
(4
)
Net unrealized (losses) gains arising during the period
(7
)
 
3

 
(4
)
 
5

 
(2
)
 
3

Reclassification of net losses (gains) to Other, net
2

 
(1
)
 
1

 
(4
)
 
1

 
(3
)
Net change
(5
)
 
2

 
(3
)
 
1

 
(1
)
 

Ending balance
$
(11
)
 
$
4

 
$
(7
)
 
$
(6
)
 
$
2

 
$
(4
)
Unrealized gains (losses) on cash flow hedges:
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
51

 
$
(12
)
 
$
39

 
$
(15
)
 
$
3

 
$
(12
)
Unrealized gains arising during the period
232

 
(57
)
 
175

 
83

 
(19
)
 
64

Reclassifications of net (gains) losses to:
 
 
 
 
 
 
 
 
 
 
 
Cost of revenues
(109
)
 
26

 
(83
)
 
(14
)
 
3

 
(11
)
Selling, general and administrative expenses
(20
)
 
4

 
(16
)
 
(3
)
 
1

 
(2
)
Net change
103

 
(27
)
 
76

 
66

 
(15
)
 
51

Ending balance
$
154

 
$
(39
)
 
$
115

 
$
51

 
$
(12
)
 
$
39

Accumulated other comprehensive income (loss):
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
(104
)
 
$
(10
)
 
$
(114
)
 
$
(112
)
 
$
6

 
$
(106
)
Other comprehensive income (loss)
209

 
(25
)
 
184

 
8

 
(16
)
 
(8
)
Ending balance
$
105

 
$
(35
)
 
$
70

 
$
(104
)
 
$
(10
)
 
$
(114
)