Stock Repurchase Program - Additional Information (Detail) - USD ($)			5 Months Ended	6 Months Ended	229 Months Ended
	Mar. 21, 2017	Sep. 22, 2016	Feb. 11, 2017	Feb. 13, 2016	Feb. 11, 2017
Stock Repurchase Program [Line Items]
Stock repurchased cumulative, shares			734,013		141,500,000
Purchase of treasury stock			$ 560,619,000	$ 550,057,000	$ 17,315,000,000
Repurchased shares of common stock at an aggregate cost			560,600,000
Increase in authorization of stock repurchase, value		$ 750,000,000
Stock repurchase authorized amended value		$ 17,900,000,000
Remaining value authorized for share repurchases			$ 584,700,000		$ 584,700,000
Share of treasury stock retired			1,800,000	2,100,000
Retained Deficit [Member]
Stock Repurchase Program [Line Items]
Retirement of treasury shares			$ 1,321,000,000	$ 1,424,000,000
Additional Paid-In Capital [Member]
Stock Repurchase Program [Line Items]
Retirement of treasury shares			$ 64,900,000	$ 67,000,000
Subsequent Event [Member]
Stock Repurchase Program [Line Items]
Stock repurchased cumulative, shares	165,703
Repurchased shares of common stock at an aggregate cost	$ 119,600,000
Increase in authorization of stock repurchase, value	750,000,000
Remaining value authorized for share repurchases	1,215,000,000
Minimum [Member] | Subsequent Event [Member]
Stock Repurchase Program [Line Items]
Stock repurchase authorized amended value	17,900,000,000
Maximum [Member] | Subsequent Event [Member]
Stock Repurchase Program [Line Items]
Stock repurchase authorized amended value	$ 18,650,000,000