Stock Repurchase Program - Additional Information (Detail) - USD ($)		5 Months Ended			241 Months Ended
	Mar. 21, 2017	Feb. 11, 2018	Feb. 10, 2018	Feb. 11, 2017	Feb. 10, 2018
Stock Repurchase Program [Line Items]
Stock repurchased cumulative, shares			824,733		143,100,000
Purchase of treasury stock			$ 527,454,000	$ 560,619,000	$ 18,354,000,000
Repurchased shares of common stock at an aggregate cost			527,500,000
Increase in authorization of stock repurchase, value	$ 750,000,000
Stock repurchase authorized amended value	$ 18,650,000,000
Remaining value authorized for share repurchases			$ 296,200,000		$ 296,200,000
Share of treasury stock retired			1,500,000	1,800,000
Retained Deficit [Member]
Stock Repurchase Program [Line Items]
Retirement of treasury shares			$ 918,500,000	$ 1,321,000,000
Additional Paid-In Capital [Member]
Stock Repurchase Program [Line Items]
Retirement of treasury shares			$ 60,500,000	$ 64,900,000
Subsequent Events [Member]
Stock Repurchase Program [Line Items]
Stock repurchased cumulative, shares		382,928
Repurchased shares of common stock at an aggregate cost		$ 264,900,000