Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Table Text Block [Abstract]

Share-Based Compensation Cost Table

The following summarizes share-based compensation expense for the years ended December 31:

millions	2013		2012			2011
Equity-Classified Awards
Restricted stock	$	122	$	103		$	80
Stock options	27		43			51
Performance-based share awards and other	1		1			1
Total equity-classified award compensation expense	150		147			132
Liability-Classified Awards
Value creation plan	—		(2		)	26
Performance-based unit awards	4		8			28
Other performance-based awards	—		165			28
Other	1		2			1
Total liability-classified award compensation expense	5		173			83
Pretax compensation expense	$	155	$	320		$	215
Income tax benefit	$	57	$	117		$	78

Restricted Stock Activity Table

The following summarizes the Company’s restricted stock activity:

	Shares (millions)		Weighted- Average Grant-Date Fair Value (per share)
Non-vested at January 1, 2013	2.82		$	79.27
Granted	1.88		$	84.17
Vested	(1.32	)	$	78.19
Forfeited	(0.16	)	$	80.37
Non-vested at December 31, 2013	3.22		$	82.53

Stock Option Valuation Assumptions Table

The Company used the following weighted-average assumptions to estimate the fair value of stock options granted during 2013, 2012, and 2011:

	2013		2012		2011
Expected option life—years	4.8		4.9		4.8
Volatility	33.9	%	44.2	%	42.0	%
Risk-free interest rate	1.3	%	0.7	%	1.5	%
Dividend yield	0.8	%	0.5	%	0.5	%

Stock Option Activity Table

The following summarizes the Company’s stock option activity:

	Shares (millions)		Weighted- Average Exercise Price (per share)		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (millions)
Outstanding at January 1, 2013	9.36		$	58.66
Granted	0.91		$	91.71
Exercised	(2.43	)	$	55.59
Forfeited or expired	(0.12	)	$	74.55
Outstanding at December 31, 2013	7.72		$	63.30	3.59	$	138.3
Vested or expected to vest at December 31, 2013	7.65		$	63.14	3.57	$	138.2
Exercisable at December 31, 2013	5.87		$	57.00	2.83	$	133.5