Stock-Based Compensation Stock Option Plans By Exercise Price Range (Details) shares in Millions	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	10.7
Options outstanding, average remaining life	6 years
Options exercisable (in shares) | shares	4.8
Exercise Price Range $12.83 to $21.81 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, minimum (in dollars per share)	$ 12.83
Exercise price range, maximum (in dollars per share)	$ 21.81
Options outstanding (in shares) | shares	2.0
Options outstanding (in dollars per share)	$ 17.25
Options outstanding, average remaining life	2 years
Options exercisable (in shares) | shares	2.0
Options exercisable (in dollars per share)	$ 17.25
Exercise Price Range $21.82 to $26.43 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, minimum (in dollars per share)	21.82
Exercise price range, maximum (in dollars per share)	$ 26.43
Options outstanding (in shares) | shares	1.9
Options outstanding (in dollars per share)	$ 24.97
Options outstanding, average remaining life	5 years
Options exercisable (in shares) | shares	1.5
Options exercisable (in dollars per share)	$ 24.85
Exercise Price Range $26.44 to $35.44 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, minimum (in dollars per share)	26.44
Exercise price range, maximum (in dollars per share)	$ 35.44
Options outstanding (in shares) | shares	1.3
Options outstanding (in dollars per share)	$ 31.71
Options outstanding, average remaining life	6 years
Options exercisable (in shares) | shares	0.6
Options exercisable (in dollars per share)	$ 31.97
Exercise Price Range $35.45 to $40.12 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, minimum (in dollars per share)	35.45
Exercise price range, maximum (in dollars per share)	$ 40.12
Options outstanding (in shares) | shares	1.4
Options outstanding (in dollars per share)	$ 37.84
Options outstanding, average remaining life	7 years
Options exercisable (in shares) | shares	0.4
Options exercisable (in dollars per share)	$ 38.08
Exercise Price Range $40.13 to $54.12 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, minimum (in dollars per share)	40.13
Exercise price range, maximum (in dollars per share)	$ 54.12
Options outstanding (in shares) | shares	4.1
Options outstanding (in dollars per share)	$ 43.74
Options outstanding, average remaining life	9 years
Options exercisable (in shares) | shares	0.3
Options exercisable (in dollars per share)	$ 43.58