Capital Stock - Additional Information (Detail)	1 Months Ended			3 Months Ended	12 Months Ended
	May 31, 2016 $ / shares shares	Dec. 31, 2014 $ / shares shares	May 31, 2014 USD ($) $ / shares shares	Dec. 31, 2014 $ / shares shares	Dec. 31, 2016 USD ($) $ / shares Directors shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 shares	Nov. 30, 2016 USD ($)	Oct. 31, 2015 USD ($)	May 31, 2015 USD ($)	Apr. 30, 2015 shares	Feb. 28, 2015 USD ($)	Oct. 31, 2014 USD ($)
Capital Stock [Line Items]
Common stock, shares authorized					1,800,000,000	1,800,000,000
Repurchase of common stock, shares					36,325,000	31,991,000	28,583,000
Repurchase price of common stock, per share | $ / shares				$ 71.29	$ 75.72	$ 74.62
Share repurchase program authorized amount | $					$ 3,000,000,000			$ 2,000,000,000	$ 3,000,000,000	$ 1,000,000,000		$ 1,000,000,000
Share repurchase program, remaining authorized repurchase amount | $					$ 1,853,000,000
Repurchase of common stock, shares		14,029,000		14,029,000	31,991,000	28,185,000	14,029,000
Stock repurchase program, authorized per share | $ / shares					$ 74.93
Share Repurchase Program Two [Member]
Capital Stock [Line Items]
Repurchase of common stock, shares					26,964,000
Repurchase price of common stock, per share | $ / shares					$ 74.20
Share Repurchase Transaction, May 2015 [Member]
Capital Stock [Line Items]
Share repurchase program, remaining authorized repurchase amount | $						$ 0
Share Repurchase Transaction, February, 2015 [Member]
Capital Stock [Line Items]
Share repurchase program, remaining authorized repurchase amount | $						0
Share Repurchase Transaction, October, 2015 [Member]
Capital Stock [Line Items]
Share repurchase program, remaining authorized repurchase amount | $						$ 2,603,000,000
Minimum [Member]
Capital Stock [Line Items]
Number of directors as per the amended and restated by-laws | Directors					3
Underwritten Secondary Offering [Member]
Capital Stock [Line Items]
Repurchase price of common stock, per share | $ / shares			$ 51.53
Additional shares repurchased			14,555,000
Company repurchased additional shares amount | $			$ 750,000,000
Kohlberg Kravis Roberts & Co [Member] | Share Repurchase Program One [Member]
Capital Stock [Line Items]
Repurchase of common stock, shares	9,361,000
Repurchase price of common stock, per share | $ / shares	$ 80.12
Percentage of discount on share repurchase	1.00%
The Bain Entities [Member]
Capital Stock [Line Items]
Repurchase price of common stock, per share | $ / shares		$ 73.26				$ 77.26
Percentage of discount on share repurchase		1.00%				1.00%
Share repurchase program authorized amount | $													$ 1,000,000,000
Repurchase of common stock, shares		7,613,000		7,613,000			7,613,000				3,806,000
Additional shares repurchased				6,416,000
Purchase price of common stock, per share | $ / shares				$ 68.96
The Bain Entities [Member] | Underwritten Secondary Offering [Member]
Capital Stock [Line Items]
Repurchase of common stock, shares			15,000,000