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Equity (Notes)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Equity
EQUITY

The activity in equity during the six-month periods ended June 30, 2018 and 2017 is as follows (dollars in millions):
 
Common Stock
 
Accumulated
Other
Comprehensive
Loss
 
Retained
Earnings
 
 
 
 
 
 
 
 
Shares
 
Amount
 
 
 
Total
Balances as of December 31, 2017
89,114,265

 
$
1,207

 
$
(8
)
 
$
1,217

 
$
2,416

Issuances of shares pursuant to equity-based plans
123,941

 
—

 
—

 
—

 
—

Stock-based compensation
—

 
1

 
—

 
—

 
1

Dividends declared
—

 
—

 
—

 
(62
)
 
(62
)
Net income
—

 
—

 
—

 
110

 
110

Balances as of June 30, 2018
89,238,206

 
$
1,208

 
$
(8
)
 
$
1,265

 
$
2,465

 
 
 
 
 
 
 
 
 
 
Balances as of December 31, 2016
88,946,704

 
$
1,201

 
$
(7
)
 
$
1,150

 
$
2,344

Issuances of shares pursuant to equity-based plans
115,856

 
1

 
—

 
—

 
1

Stock-based compensation
—

 
1

 
—

 
—

 
1

Dividends declared
—

 
—

 
—

 
(59
)
 
(59
)
Net income
—

 
—

 
—

 
105

 
105

Balances as of June 30, 2017
89,062,560

 
$
1,203

 
$
(7
)
 
$
1,196

 
$
2,392