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Equity (Notes)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Equity
EQUITY

The activity in equity during the nine-month periods ended September 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
130,394

 
—

 
—

 
—

 
—

Stock-based compensation
—

 
2

 
—

 
—

 
2

Dividends declared
—

 
—

 
—

 
(95
)
 
(95
)
Net income
—

 
—

 
—

 
163

 
163

Balances as of September 30, 2018
89,244,659

 
$
1,209

 
$
(8
)
 
$
1,285

 
$
2,486

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

 
$
1,201

 
$
(7
)
 
$
1,150

 
$
2,344

Issuances of shares pursuant to equity-based plans
145,251

 
1

 
—

 
—

 
1

Stock-based compensation
—

 
2

 
—

 
—

 
2

Dividends declared
—

 
—

 
—

 
(90
)
 
(90
)
Net income
—

 
—

 
—

 
145

 
145

Balances as of September 30, 2017
89,091,955

 
$
1,204

 
$
(7
)
 
$
1,205

 
$
2,402