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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Schedule of Stock-based Compensation Expense, Tax Effect
Stock-based compensation expense was as follows:

 
 
Year Ended December 31,
(in millions)
 
2018
 
2017
 
2016
Stock-based compensation expense, pre-tax
 
$
38

 
$
42

 
$
23

Income tax benefit recognized in earnings
 
7

 
17

 
9
Schedule of Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
Summary of Stock-based Compensation Activity

 
 
2018
 
2017
 
2016
(shares in thousands)
 
Shares
 
Weighted
Average Grant
Date Fair
Value
 
Shares
 
Weighted
Average Grant
Date Fair
Value
 
Shares
 
Weighted
Average Grant
Date Fair
Value
Restricted Stock Units / Shares
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding at January 1
 
3,125

 
$
16.29

 
1,961

 
$
13.99

 
782

 
$
11.70

Granted
 
1,246

 
18.82

 
1,988

 
16.75

 
2,602

 
9.61

Vested
 
(1,501
)
 
17.30

 
(215
)
 
19.98

 
(119
)
 
9.43

Canceled
 
(471
)
 
16.62

 
(609
)
 
15.88

 
(121
)
 
10.55

Impact of spin-off(1)
 
—

 
n/a

 
—

 
n/a

 
(1,183
)
 
n/a

Outstanding at December 31
 
2,399

 
16.90

 
3,125

 
16.29

 
1,961

 
13.99

 
 
 
 
 
 
 
 
 
 
 
 
 
Performance Stock Units / Shares
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding at January 1
 
5,429

 
$
16.55

 
4,926

 
$
13.99

 
7,522

 
$
11.57

Granted
 
730

 
18.64

 
3,933

 
16.76

 
1,850

 
9.35

Vested
 
(980
)
 
17.12

 
(1,696
)
 
19.67

 
—

 
—

Canceled
 
(622
)
 
16.59

 
(1,734
)
 
17.46

 
(1,478
)
 
11.96

Impact of spin-off(1)
 
—

 
n/a

 
—

 
n/a

 
(2,968
)
 
n/a

Outstanding at December 31
 
4,557

 
16.76

 
5,429

 
16.55

 
4,926

 
13.99
Schedule of Unrecognized Compensation Cost, Nonvested Awards
The total unrecognized compensation cost related to non-vested stock-based awards at December 31, 2018 was as follows (in millions):

Awards
 
Unrecognized Compensation
 
Remaining Weighted-Average Vesting Period (Years)
Restricted Stock Units / Shares
 
$
21

 
0.9
Performance Stock Units / Shares
 
15

 
0.8
Total
 
$
36

 
 
Schedule of Aggregate intrinsic value restricted stock and performance shares compensation awards
The aggregate intrinsic value of outstanding RSUs and PSUs awards were as follows (in millions):

Awards
 
December 31, 2018
Restricted Stock Units / Shares
 
$
26

Performance Stock Units / Shares
 
48
Schedule of Stock options outstanding and exercisable
Information related to stock options outstanding and exercisable at December 31, 2018 was as follows

(in millions)
 
Options
 
 
Outstanding
 
Exercisable
Aggregate intrinsic value
 
$
1

 
$
1

Weighted-average remaining contractual life (years)
 
0.6

 
0.6
Schedule of Vested and exercised stock based awards total intrinsic value and tax benefit realized
The total intrinsic value and actual tax benefit realized for vested and exercised stock-based awards were as follows:

(in millions)
 
December 31, 2018
 
December 31, 2017
 
December 31, 2016
Awards
 
Total Intrinsic Value
 
Cash Received
 
Tax Benefit
 
Total Intrinsic Value
 
Cash Received
 
Tax Benefit
 
Total Intrinsic Value
 
Cash Received
 
Tax Benefit
Restricted Stock Units / Shares
 
$
20

 
$
—

 
$
4

 
$
3

 
$
—

 
$
1

 
$
1

 
$
—

 
$
—

Performance Stock Units / Shares
 
18

 
—

 
4

 
25

 
—

 
10

 
—

 
—

 
—

Stock Options
 
2

 
2

 
—

 
3

 
6

 
1

 
3

 
9

 
1