Stock Options and Other Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Stock Options and Other Stock Based Compensation

Summary of option activity

				Weighted
		Weighted		Average
		Average		Remaining
	Number of	Exercise		Contractual	Aggregate
	Shares	Price		Term	Intrinsic
	(thousands)	(per share)		(years)	Value
Options outstanding at January 1, 2016	2,621	$	23.64
Granted	1,098		15.10
Exercised	(504)		10.13
Forfeited or expired	(119)		21.24
Options outstanding at  December 31, 2016	3,096		22.91	4.2	$	3
Options vested or expected to vest at  December 31, 2016	3,096	$	22.91	2.3	$	3
Options exercisable at  December 31, 2016	1,342	$	27.71	4.2	$	—

Additional information related to stock options

	2016		2015		2014
Weighted average grant-date fair value of options granted (per share)	$	4.98	$	7.79	$	13.17
Aggregate intrinsic value of options exercised	$	2	$	—	$	3
Aggregate cash received from options exercised	$	5	$	1	$	5

Schedule of weighted average assumptions used to estimate the fair value of each option grant on the date of grant using the Black-Scholes option pricing model

	2016		2015		2014
Expected life of options (years)	5.20		5.00		5.00
Expected stock price volatility	32.8	%	34.5	%	43.0	%
Risk-free interest rate	1.5	%	1.7	%	1.6	%
Expected dividend yield	0.0	%	0.0	%	0.0	%

Restricted shares and restricted share units activity

		Weighted
	Number of	Average
	Restricted	Grant-Date
	Shares	Fair Value
	(thousands)	(per share)
Nonvested at January 1, 2016	672	$	23.66
Granted	389		15.70
Vested	(215)		25.88
Forfeited	(10)		21.11
Nonvested at December 31, 2016	836		19.42
Awards granted during 2015		$	22.69
Awards granted during 2014		$	33.36

	2016		2015		2014
Total fair value of shares vested	$	6	$	4	$	5

Performance vested restricted share unit activity

	Number of Performance	Weighted Average
	Vested Restricted Shares	Grant-Date Fair Value
	Units (thousands)	(per unit)
Nonvested at January 1, 2016	933	$	26.80
Granted	726		15.10
Vested	(158)		26.10
Forfeited/Cancelled	(146)		25.41
Nonvested at December 31, 2016	1,355		20.76
Awards granted during 2015		$	23.63
Awards granted during 2014		$	33.41