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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of pre-tax compensation expense and the related income tax benefit for these stock-based incentives
Pre-tax compensation expense for these stock-based incentives was as follows, in millions: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Long-term stock awards
$
5

 
$
6

 
$
17

 
$
19

Stock options
1

 
—

 
3

 
2

Restricted stock units
1

 
—

 
3

 
1

Phantom stock awards and stock appreciation rights
1

 
2

 
—

 
7

Total
$
8

 
$
8

 
$
23

 
$
29
Schedule of the Company's long-term stock award activity
Our long-term stock award activity was as follows, shares in millions: 
 
Nine Months Ended September 30,
 
2018
 
2017
Unvested stock award shares at January 1
3

 
4

Weighted average grant date fair value
$
24

 
$
20

 
 
 
 
Stock award shares granted
1

 
1

Weighted average grant date fair value
$
42

 
$
34

 
 
 
 
Stock award shares vested
2

 
2

Weighted average grant date fair value
$
21

 
$
18

 
 
 
 
Stock award shares forfeited
—

 
—

Weighted average grant date fair value
$
31

 
$
24

 
 
 
 
Unvested stock award shares at September 30
2

 
3

Weighted average grant date fair value
$
30

 
$
24
Schedule of the Company's stock option activity
Our stock option activity was as follows, shares in millions: 
 
 
Nine Months Ended September 30,
 
 
2018
 
 
2017
Option shares outstanding, January 1
 
5

 
 
7

Weighted average exercise price
$
16

 
$
15

 
 
 
 
 
 
Option shares granted
 
—

 
 
—

Weighted average exercise price
$
42

 
$
34

 
 
 
 
 
 
Option shares exercised
 
1

 
 
1

Aggregate intrinsic value on date of exercise (A)
$
47 million

 
$
36 million

Weighted average exercise price
$
11

 
$
15

 
 
 
 
 
 
Option shares forfeited
 
—

 
 
—

Weighted average exercise price
$
31

 
$
—

 
 
 
 
 
 
Option shares outstanding, September 30
 
4

 
 
6

Weighted average exercise price
$
20

 
$
16

Weighted average remaining option term (in years)
 
5

 
 
4

 
 
 
 
 
 
Option shares vested and expected to vest, September 30
 
4

 
 
6

Weighted average exercise price
$
20

 
$
16

Aggregate intrinsic value (A)
$
69 million

 
$
132 million

Weighted average remaining option term (in years)
 
5

 
 
4

 
 
 
 
 
 
Option shares exercisable (vested), September 30
 
3

 
 
4

Weighted average exercise price
$
15

 
$
13

Aggregate intrinsic value (A)
$
62 million

 
$
115 million

Weighted average remaining option term (in years)
 
3

 
 
3

 
 
(A)
Aggregate intrinsic value is calculated using our stock price at each respective date, less the exercise price (grant date price), multiplied by the number of shares.
Schedule of weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model
The weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model were as follows: 
 
Nine Months Ended September 30,
 
2018
 
2017
Weighted average grant date fair value
$
12.52

 
$
9.68

Risk-free interest rate
2.71
%
 
2.16
%
Dividend yield
1.00
%
 
1.19
%
Volatility factor
29.00
%
 
30.00
%
Expected option life
6 years

 
6 years