Share-Based Compensation - Schedule of Share-Based Compensation Arrangement by Share Based Payment Award Options Outstanding and Options Exercisable (Detail) - Jun. 30, 2015 - $ / shares shares in Millions	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at June 30,2015, Option outstanding	12.5
Average remaining contractual life (years), Options outstanding	5 years 6 months 15 days
Weighted average exercise price, Options outstanding	$ 23.49
Exercisable at June 30, 2015, Options exercisable	9.6
Weighted average exercise price, Options exercisable	$ 22.80
$7.27 - 19.47
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, minimum	7.27
Range of exercise prices, maximum	$ 19.47
Outstanding at June 30,2015, Option outstanding	4.0
Average remaining contractual life (years), Options outstanding	5 years 7 days
Weighted average exercise price, Options outstanding	$ 17.49
Exercisable at June 30, 2015, Options exercisable	3.6
Weighted average exercise price, Options exercisable	$ 17.30
$ 20.01 - 26.49
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, minimum	20.01
Range of exercise prices, maximum	$ 26.49
Outstanding at June 30,2015, Option outstanding	4.9
Average remaining contractual life (years), Options outstanding	5 years 6 months 7 days
Weighted average exercise price, Options outstanding	$ 24.95
Exercisable at June 30, 2015, Options exercisable	3.3
Weighted average exercise price, Options exercisable	$ 24.29
$ 26.84 - 30.34
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, minimum	26.84
Range of exercise prices, maximum	$ 30.34
Outstanding at June 30,2015, Option outstanding	3.6
Average remaining contractual life (years), Options outstanding	6 years 1 month 28 days
Weighted average exercise price, Options outstanding	$ 28.12
Exercisable at June 30, 2015, Options exercisable	2.7
Weighted average exercise price, Options exercisable	$ 28.44
$ 30.53 - 37.73
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, minimum	30.53
Range of exercise prices, maximum	$ 37.73
Average remaining contractual life (years), Options outstanding	6 years 2 months 1 day
Weighted average exercise price, Options outstanding	$ 34.02
Weighted average exercise price, Options exercisable	$ 32.74