Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 24, 2018	Mar. 25, 2018	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, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 27, 2018
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	283,000,000				285,000,000								283,000,000	285,000,000
Common Stock, value issued	$ 281,000,000				$ 284,000,000								$ 281,000,000	$ 284,000,000
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													4,700,000	7,100,000	8,900,000
Cash paid for repurchases of common stock													$ 1,492,000,000	$ 2,001,000,000	$ 2,096,000,000
Additional share repurchase program authorized amount																$ 1,000,000,000
Remaining authorized repurchase amount under share repurchase program	$ 3,000,000,000												$ 3,000,000,000
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													1,492,000,000	2,001,000,000	2,096,000,000
Dividends paid													$ 2,347,000,000	$ 2,163,000,000	$ 2,048,000,000
Common stock dividends per share paid (in dollars per share)	$ 2.2	$ 2.00	$ 2	$ 2.00	$ 2.00	$ 1.82	$ 1.82	$ 1.82	$ 1.82	$ 1.65	$ 1.65	$ 1.65	$ 8.20	$ 7.46	$ 6.77
Retained Earnings
Shareholders Equity [Line Items]
Reduction to stockholder's equity due to repurchases of common stock													$ 1,083,000,000	$ 1,596,000,000	$ 1,692,000,000