Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

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

Schedule of stock-based compensation expense and tax benefits

The following table reflects activity related to our stock-based compensation arrangements (in millions):

	Year Ended December 31,
	2013		2012		2011
Stock-based compensation expense	$	64	$	58	$	58
Tax benefit recognized on stock-based compensation expense	22		20		20
Tax benefit realized for tax deductions resulting from exercises and vestings	66		45		35
Effect of tax deductions in excess of recognized stock-based compensation expense reported as a financing cash flow	47		27		23

Summary of weighted-average assumptions used in fair value measurements

A summary of the weighted-average assumptions used in our fair value measurements is presented in the table below.

	Year Ended December 31,
	2013		2012		2011
Expected life in years	6.0		6.0		6.0
Expected volatility	49.63	%	49.11	%	49.30	%
Expected dividend yield	2.27	%	2.39	%	2.28	%
Risk-free interest rate	1.77	%	0.85	%	1.44	%

Summary of stock option awards

A summary of the status of our stock option awards is presented in the table below.

	Number of Stock Options		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
					(in years)	(in millions)
Outstanding as of January 1, 2013	13,214,728		$	28.54
Granted	201,300		39.67
Exercised	(3,837,090	)	15.21
Expired	(1,780,113	)	49.45
Options granted on conversion related to separation of retail business	759,268		28.84
Outstanding as of December 31, 2013	8,558,093		27.88		3.5	$	216
Exercisable as of December 31, 2013	8,037,807		27.66		3.1	206

The following table reflects activity related to our stock options granted (in millions, except per share data):

	Year Ended December 31,
	2013		2012		2011
Weighted average grant-date fair value price per share	$	15.83	$	10.98	$	10.10
Intrinsic value of stock options exercised	101		78		63
Cash received from stock option exercises	59		59		49

Summary of restricted stock awards

A summary of the status of our restricted stock awards is presented in the table below.

	Number of Shares		Weighted- Average Grant-Date Fair Value Per Share
Nonvested shares as of January 1, 2013	2,920,288		$	24.76
Granted	1,255,742		39.55
Vested	(2,113,647	)	23.73
Forfeited	(31,546	)	23.73
Shares granted on conversion related to separation of retail business	174,477		23.42
Nonvested shares as of December 31, 2013	2,205,314		32.23

Summary of performance awards

A summary of the status of our performance awards considered granted is presented below.

	Nonvested Awards		Vested Awards
Awards outstanding as of January 1, 2013	989,414		208,916
Granted	415,317		—
Vested	(442,274	)	442,274
Converted	—		(534,515	)
Forfeited	(50,076	)	(116,675	)
Shares granted on conversion related to separation of retail business	34,784		—
Awards outstanding as of December 31, 2013	947,165		—

There were three tranches of performance awards granted during the year ended December 31, 2013 as follows:

	Awards Granted	Expected Conversion Rate	Fair Value Per Share
Third tranche of 2011 awards	227,565	100%	$	38.77
Second tranche of 2012 awards	105,030	100%	38.77
First tranche of 2013 awards	82,722	100%	38.77
Total	415,317

Performance awards converted during the year ended December 31, 2013 were as follows:

	Vested Awards Converted	Actual Conversion Rate	Number of Shares Issued	Awards Forfeited
2010 awards	417,833	100%	417,833	—
2011 awards	233,357	50%	116,682	116,675
Total	651,190		534,515	116,675