Stock Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Award activity — (shares in millions)



	Options				SARs			RSUs				PSUs
	Shares		Exercise Price per Share*		Shares	Exercise Price per Share*		Shares		Grant-Date Fair Value per Share*		Shares		Grant-Date Fair Value per Share*
December 31, 2015	1.8		$	14.50	0.3	$	15.46	1.3		$	20.09	0.4		$	22.92
Granted								1.2		13.31		0.4		13.21
Exercised or vested	(0.1	)	11.74					(0.6	)	16.51
Forfeited or expired	(0.2	)	16.31					(0.1	)	16.75		(0.2	)	22.61
December 31, 2016	1.5		14.56		0.3	15.42		1.8		16.54		0.6		16.31

* Weighted-average

Total Stock Compensation Expense and Other Annual Disclosures [Table Text Block]



	2016		2015		2014
Total stock compensation expense	$	17	$	14	$	16
Total grant-date fair value of awards vested	11		21		13
Cash received from exercise of stock options	2		2		7
Cash paid to settle SARs and RSUs	1		2		2
Intrinsic value of stock options and SARs exercised	1		1		7
Intrinsic value of RSUs and PSUs vested	7		16		8

Key Assumptions as Part of Monte Carlo Simulation Model [Table Text Block]

For the portion of the PSU award based on shareholder returns, we estimated the fair value at grant date using various assumptions as part of a Monte Carlo simulation. The expected term represents the period from the grant date to the end of the performance period. The risk-free interest rate was based on U.S. Treasury constant maturity rates at the grant date. The dividend yield was calculated by dividing the expected annual dividend by the average stock price over the prior year. The expected volatility was based on historical volatility using daily stock price observations.



	PSUs
	2016		2015		2014
Expected term (in years)	3.0		3.0		3.0
Risk-free interest rate	1.00	%	0.89	%	0.64	%
Dividend yield	1.40	%	0.98	%	1.02	%
Expected volatility	33.4	%	33.9	%	43.6	%