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Equity (Tables)
 12 Months Ended
Dec. 31, 2012
Equity [Abstract]  
Share activity
For the years ended December 31, 2012, 2011, and 2010, activity in the number of shares of common stock and treasury stock was as follows (in millions):
 
Common
Stock
 
Treasury
Stock
Balance as of December 31, 2009
673

 
(109
)
Transactions in connection with
stock-based compensation plans:
 
 
 
Stock issuances
—

 
5

Stock repurchases
—

 
(1
)
Balance as of December 31, 2010
673

 
(105
)
Transactions in connection with
stock-based compensation plans:
 
 
 
Stock issuances
—

 
5

Stock repurchases
—

 
(17
)
Balance as of December 31, 2011
673

 
(117
)
Transactions in connection with
stock-based compensation plans:
 
 
 
Stock issuances
—

 
6

Stock repurchases
—

 
(6
)
Stock repurchases under buyback program
—

 
(4
)
Balance as of December 31, 2012
673

 
(121
)
Income tax effects related to components of other comprehensive income
The following table reflects the tax effects allocated to each component of other comprehensive income for the years ended December 31, 2012, 2011, and 2010:
 
Before-Tax Amount
 
Tax Expense (Benefit)
 
Net Amount
Year Ended December 31, 2012:
 
 
 
 
 
Foreign currency translation adjustment
$
164

 
$
—

 
$
164

Pension and other postretirement benefits:
 
 
 
 
 
Loss arising during the year related to:
 
 
 
 
 
Net actuarial loss
(228
)
 
(79
)
 
(149
)
Prior service cost
(9
)
 
(3
)
 
(6
)
(Gain) loss reclassified into income related to:
 
 
 
 
 
Net actuarial loss
34

 
12

 
22

Prior service credit
(20
)
 
(7
)
 
(13
)
Settlement
12

 
—

 
12

Net loss on pension and other
postretirement benefits
(211
)
 
(77
)
 
(134
)
Derivative instruments designated and
qualifying as cash flow hedges:
 
 
 
 
 
Net gain arising during the year
45

 
16

 
29

Net gain reclassified into income
(73
)
 
(26
)
 
(47
)
Net loss on cash flow hedges
(28
)
 
(10
)
 
(18
)
Other comprehensive income (loss)
$
(75
)
 
$
(87
)
 
$
12

 
Before-Tax Amount
 
Tax Expense (Benefit)
 
Net Amount
Year Ended December 31, 2011:
 
 
 
 
 
Foreign currency translation adjustment
$
(122
)
 
$
—

 
$
(122
)
Pension and other postretirement benefits:
 
 
 
 
 
Loss arising during the year related to:
 
 
 
 
 
Net actuarial loss
(285
)
 
(100
)
 
(185
)
Prior service cost
(4
)
 
(1
)
 
(3
)
(Gain) loss reclassified into income related to:
 
 
 
 
 
Net actuarial loss
14

 
4

 
10

Prior service credit
(21
)
 
(7
)
 
(14
)
Settlement
4

 
1

 
3

Net loss on pension and other
postretirement benefits
(292
)
 
(103
)
 
(189
)
Derivative instruments designated and
qualifying as cash flow hedges:
 
 
 
 
 
Net gain arising during the year
32

 
11

 
21

Net gain reclassified into income
(3
)
 
(1
)
 
(2
)
Net gain on cash flow hedges
29

 
10

 
19

Other comprehensive loss
$
(385
)
 
$
(93
)
 
$
(292
)
Year Ended December 31, 2010:
 
 
 
 
 
Foreign currency translation adjustment
$
158

 
$
—

 
$
158

Pension and other postretirement benefits:
 

 
 
 
 
Gain (loss) arising during the year related to:
 
 
 
 
 
Net actuarial loss
(40
)
 
(6
)
 
(34
)
Prior service credit
31

 
11

 
20

(Gain) loss reclassified into income related to:
 
 
 
 
 
Net actuarial loss
6

 
2

 
4

Prior service credit
(17
)
 
(6
)
 
(11
)
Settlement
4

 
1

 
3

Net gain (loss) on pension and other postretirement benefits
(16
)
 
2

 
(18
)
Derivative instruments designated and
qualifying as cash flow hedges:
 

 
 
 
 
Net loss arising during the year
(2
)
 
(1
)
 
(1
)
Net gain reclassified into income
(178
)
 
(62
)
 
(116
)
Net loss on cash flow hedges
(180
)
 
(63
)
 
(117
)
Other comprehensive income (loss)
$
(38
)
 
$
(61
)
 
$
23
Changes in components of accumulated other comprehensive income (loss)
Changes in the balances of each component of accumulated other comprehensive income (loss) were as follows (in millions):
 
Foreign
Currency
Translation
Adjustment
 
Pension/
OPEB
Liability
Adjustment
 
Net Gain (Loss) On Cash Flow Hedges
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance as of December 31, 2009
$
465

 
$
(217
)
 
$
117

 
$
365

Other comprehensive income (loss)
158

 
(18
)
 
(117
)
 
23

Balance as of December 31, 2010
623

 
(235
)
 
—

 
388

Other comprehensive income (loss)
(122
)
 
(189
)
 
19

 
(292
)
Balance as of December 31, 2011
501

 
(424
)
 
19

 
96

Other comprehensive income (loss)
164

 
(134
)
 
(18
)
 
12

Balance as of December 31, 2012
$
665

 
$
(558
)
 
$
1

 
$
108