Capital Stock (Tables)

12 Months Ended

Dec. 31, 2013

Capital Stock [Abstract]

Summary of Stock Option Activity

	Shares (in millions)		Weighted Average Exercise Price		Weighted-Average Remaining Term (in years)	Aggregate Intrinsic Value
Outstanding January 1	19.7		$	52.23
Granted	3.1		64.11
Exercised	(5.0	)	47.96
Canceled	(0.8	)	57.75
Outstanding December 31	17.0		$	55.35	5.5	$	337.4
Exercisable December 31	10.1		$	53.77	3.9	$	216.7
Options expected to vest	6.5		$	57.47	7.9	$	114.0

Summary of RSU and PSU Activity

	Shares (in millions)			Weighted Average Grant date Fair value
	RSUs		PSUs	RSUs		PSUs
Nonvested at January 1	1.5		0.2	$	52.53	$	54.78
Granted	0.8		0.1	60.81		64.01
Vested	(0.7	)	—	52.92		—
Canceled	(0.1	)	—	54.80		—
Nonvested at December 31	1.5		0.3	$	56.19	$	58.10