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Shareholders' Equity (Notes)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Shareholders' Equity Shareholders’ Equity
The following tables provide changes in shareholders’ equity during the three and six months ended June 30, 2019 and 2018.
 
Three Months Ended June 30, 2019
 
Number of Shares
 
Amount
 
(In millions)
 
Common Shares
 
Treasury Shares
 
Common Stock
 
Additional
Paid-In
Capital
 
Accumulated
Other
Comprehensive
Loss
 
Retained
Earnings
 
Treasury Stock
 
Total Equity
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at March 31, 2019
 
791

 
399

 
$
8

 
$
1,034

 
$
(85
)
 
$
11,860

 
$
(10,423
)
 
$
2,394

 
Net income
 
 
 
 
 
 
 
 
 
 
 
223

 
 
 
223

 
Other comprehensive loss
 
 
 
 
 
 
 
 
 
(108
)
 
 
 
 
 
(108
)
 
Share-based compensation
 
 
 
 
 
 
 
15

 
 
 
 
 
 
 
15

 
Shares issued under stock plans
 
 
 
—

 
 
 
7

 
 
 
 
 
15

 
22

 
Purchases of treasury stock
 
 
 
—

 
 
 
 
 
 
 
 
 
—

 
—

 
Balance at June 30, 2019
 
791

 
399

 
$
8

 
$
1,056

 
$
(193
)
 
$
12,083

 
$
(10,408
)
 
$
2,546

 
Three Months Ended June 30, 2018
 
Number of Shares
 
Amount
 
(In millions)
 
Common Shares
 
Treasury Shares
 
Common Stock
 
Additional
Paid-In
Capital
 
Accumulated
Other
Comprehensive
Loss
 
Retained
Earnings
 
Treasury Stock
 
Total Equity
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at March 31, 2018
 
791

 
380

 
$
8

 
$
1,005

 
$
(56
)
 
$
10,871

 
$
(8,857
)
 
$
2,971

 
Net income
 
 
 
 
 
 
 
 
 
 
 
251

 
 
 
251

 
Other comprehensive loss
 
 
 
 
 
 
 
 
 
(10
)
 
 
 
 
 
(10
)
 
Share-based compensation
 
 
 
 
 
 
 
17

 
 
 
 
 
 
 
17

 
Shares issued under stock plans
 
 
 
—

 
 
 
1

 
 
 
 
 
11

 
12

 
Purchases of treasury stock
 
 
 
5

 
 
 
 
 
 
 
 
 
(391
)
 
(391
)
 
Balance at June 30, 2018
 
791

 
385

 
$
8

 
$
1,023

 
$
(66
)
 
$
11,122

 
$
(9,237
)
 
$
2,850

 
Six Months Ended June 30, 2019
 
Number of Shares
 
Amount
 
(In millions)
 
Common Shares
 
Treasury Shares
 
Common Stock
 
Additional
Paid-In
Capital
 
Accumulated
Other
Comprehensive
Loss
 
Retained
Earnings
 
Treasury Stock
 
Total Equity
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2018
 
791

 
399

 
$
8

 
$
1,057

 
$
(67
)
 
$
11,635

 
$
(10,340
)
 
$
2,293

 
Net income
 
 
 
 
 
 
 
 
 
 
 
448

 
 
 
448

 
Other comprehensive loss
 
 
 
 
 
 
 
 
 
(126
)
 
 
 
 
 
(126
)
 
Share-based compensation
 
 
 
 
 
 
 
34

 
 
 
 
 
 
 
34

 
Shares issued under stock plans
 
 
 
(2
)
 
 
 
(35
)
 
 
 
 
 
52

 
17

 
Purchases of treasury stock
 
 
 
2

 
 
 
 
 
 
 
 
 
(120
)
 
(120
)
 
Balance at June 30, 2019
 
791

 
399

 
$
8

 
$
1,056

 
$
(193
)
 
$
12,083

 
$
(10,408
)
 
$
2,546

 
Six Months Ended June 30, 2018
 
Number of Shares
 
Amount
 
(In millions)
 
Common Shares
 
Treasury Shares
 
Common Stock
 
Additional
Paid-In
Capital
 
Accumulated
Other
Comprehensive
Loss
 
Retained
Earnings
 
Treasury Stock
 
Total Equity
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2017
 
791

 
376

 
$
8

 
$
1,031

 
$
(54
)
 
$
10,240

 
$
(8,494
)
 
$
2,731

 
Net income
 
 
 
 
 
 
 
 
 
 
 
674

 
 
 
674

 
Other comprehensive loss
 
 
 
 
 
 
 
 
 
(12
)
 
 
 
 
 
(12
)
 
Share-based compensation
 
 
 
 
 
 
 
36

 
 
 
 
 
 
 
36

 
Shares issued under stock plans
 
 
 
(2
)
 
 
 
(44
)
 
 
 
 
 
46

 
2

 
Purchases of treasury stock
 
 
 
11

 
 
 
 
 
 
 
 
 
(789
)
 
(789
)
 
Cumulative-effect adjustment of ASU 2014-09 adoption
 
 
 
 
 
 
 
 
 
 
 
208

 
 
 
208

 
Cumulative-effect adjustment of ASU 2017-12 adoption
 
 
 
 
 
 
 
 
 
3

 
(3
)
 
 
 
—

 
Cumulative-effect adjustment of ASU 2018-02 adoption
 
 
 
 
 
 
 
 
 
(3
)
 
3

 
 
 
—

 
Balance at June 30, 2018
 
791

 
385

 
$
8

 
$
1,023

 
$
(66
)
 
$
11,122

 
$
(9,237
)
 
$
2,850