Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 24, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 31, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 31, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 28, 2017
Shareholders Equity [Line Items]
Common stock, shares authorized	1,500,000,000.0				1,500,000,000.0								1,500,000,000.0	1,500,000,000.0
Preferred stock, shares authorized	50,000,000				50,000,000								50,000,000	50,000,000
Common stock, shares issued and outstanding	285,000,000				290,000,000								285,000,000	290,000,000
Common stock, shares outstanding for Balance Sheet presentation purposes	284,000,000				289,000,000								284,000,000	289,000,000
Preferred stock, shares issued	0				0								0	0
Preferred stock, shares outstanding	0				0								0	0
Number of shares of common stock repurchased with cash													7,100,000	8,900,000	15,200,000
Cash paid for repurchases of common stock													$ 2,001,000,000	$ 2,096,000,000	$ 3,071,000,000
Additional share repurchase program authorized amount																$ 2,000,000,000.0
Remaining authorized repurchase amount under share repurchase program	$ 3,500,000,000												$ 3,500,000,000
Common stock, par value (in USD per share)	$ 1				$ 1								$ 1	$ 1
Additional paid-in capital	$ 0				$ 0								$ 0	$ 0		$ 0
Reduction to stockholder's equity due to repurchases of common stock													2,001,000,000	2,096,000,000	3,071,000,000
Dividends preferred stock cash													$ 2,200,000,000	$ 2,000,000,000	$ 1,900,000,000
Common stock dividends per share declared (in dollars per share)	$ 2.00	$ 1.82	$ 1.82	$ 1.82	$ 1.82	$ 1.65	$ 1.65	$ 1.65	$ 1.65	$ 1.50	$ 1.50	$ 1.50	$ 7.46	$ 6.77	$ 6.15
Retained Earnings
Shareholders Equity [Line Items]
Reduction to stockholder's equity due to repurchases of common stock													$ 1,596,000,000	$ 1,692,000,000	$ 2,400,000,000