Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Issuance of Restricted Stock Units and Aggregate Weighted Average Grant Date Fair Values

The following table details our issuance of restricted stock units and the aggregate weighted average grant date fair values under these plans for the years indicated:

TABLE 16.1

(dollars in millions)	2019		2018		2017
Restricted stock units	1,182,197		962,799		713,998
Weighted average grant date fair values	$	13	$	13	$	10

Summary of Activity Relating to Restricted Stock Units

The following table summarizes the activity relating to restricted stock units during the periods indicated:

TABLE 16.2

	2019				2018				2017
	Units		Weighted Average Grant Price per Share		Units		Weighted Average Grant Price per Share		Units		Weighted Average Grant Price per Share
Unvested units outstanding at beginning of year	2,556,174		$	13.51	1,975,862		$	13.64	1,836,363		$	12.97
Granted	1,182,197		10.94		962,799		13.21		713,998		14.67
Net adjustment due to performance	—		—		—		—		(64,861	)	13.85
Vested	(655,208	)	13.15		(258,031	)	13.19		(542,580	)	12.71
Forfeited/expired	(332,814	)	12.72		(214,743	)	13.39		(31,018	)	14.03
Dividend reinvestment	108,008		11.84		90,287		12.61		63,960		13.80
Unvested units outstanding at end of year	2,858,357		12.56		2,556,174		13.51		1,975,862		13.64

Schedule of Certain Information Related to Restricted Stock Units

The following table provides certain information related to restricted stock units:

TABLE 16.3

Year Ended December 31	2019		2018		2017
(in millions)
Stock-based compensation expense	$	12	$	10	$	8
Tax benefit related to stock-based compensation expense	2		2		3
Fair value of units vested	7		3		8

Components of Restricted Stock Units

The components of the restricted stock units as of December 31, 2019 are as follows:

TABLE 16.4

(dollars in millions)	Service- Based Units		Performance- Based Units		Total
Unvested restricted stock units	1,922,120		936,237		2,858,357
Unrecognized compensation expense	$	10	$	4	$	14
Intrinsic value	$	24	$	12	$	36
Weighted average remaining life (in years)	1.83		1.81		1.82

Summary of Activity Related to Stock Options Units

The following table summarizes the activity relating to stock options during the periods indicated:

TABLE 16.5

	2019		Weighted Average Exercise Price per Share		2018		Weighted Average Exercise Price per Share		2017		Weighted Average Exercise Price per Share
Options outstanding at beginning of year	458,354		$	7.99	722,650		$	7.96	892,532		$	8.95
Assumed from acquisitions	—		—		—		—		207,645		8.92
Exercised	(183,566	)	7.86		(253,899	)	7.77		(255,503	)	10.21
Forfeited/expired	(28,704	)	7.65		(10,397	)	11.98		(122,024	)	12.12
Options outstanding and exercisable at end of year	246,084		8.14		458,354		7.99		722,650		7.96

Summary of Stock Options Outstanding

The following table summarizes information about stock options outstanding at December 31, 2019: 

TABLE 16.6

Range of Exercise Prices	Options Outstanding and Exercisable	Weighted Average Remaining Contractual Years	Weighted Average Exercise Price
$3.45 - $5.18	54,148	1.26	$	4.82
$5.19 - $7.78	40,022	3.11	6.90
$7.79 - $11.37	151,914	4.71	9.64
	246,084

Summary of Stock Options Exercised

The following table summarizes certain information relating to stock options exercised:

TABLE 16.7

Year Ended December 31	2019		2018		2017
(in millions)
Proceeds from stock options exercised	$	1	$	2	$	2
Intrinsic value of stock options exercised	1		1		1