Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 24, 2018	Mar. 25, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 25, 2020
Shareholders Equity [Line Items]
Common stock, shares authorized (in shares)	1,500,000,000				1,500,000,000								1,500,000,000	1,500,000,000
Preferred stock, shares authorized (in shares)	50,000,000				50,000,000								50,000,000	50,000,000
Common stock, shares issued and outstanding (in shares)	280,000,000				281,000,000								280,000,000	281,000,000
Common stock, shares outstanding (in shares)	279,000,000				280,000,000								279,000,000	280,000,000
Preferred stock, shares issued (in shares)	0				0								0	0
Preferred stock, shares outstanding (in shares)	0				0								0	0
Stock repurchased (in shares)													3,000,000.0	3,500,000	4,700,000
Repurchases of common stock													$ 1,100,000,000	$ 1,200,000,000	$ 1,492,000,000
Accelerate Share Repurchase (ASR) authorized amount																$ 1,300,000,000
Cash paid for repurchases of common stock													$ 1,100,000,000	$ 1,200,000,000	1,492,000,000
Average price paid per share (in dollars per share)													$ 347.16
Remaining amount authorized (in shares)	$ 3,000,000,000.0												$ 3,000,000,000.0
Common stock, par value (in dollars per share)	$ 1				$ 1								$ 1	$ 1
Dividends declared													$ (2,757,000,000)	$ (2,550,000,000)	$ (2,342,000,000)
Common stock dividends per share paid (in dollars per share)	$ 2.60	$ 2.40	$ 2.40	$ 2.40	$ 2.40	$ 2.20	$ 2.20	$ 2.20	$ 2.20	$ 2.00	$ 2.00	$ 2.00	$ 9.80	$ 9.00
Dividends declared, per share (in dollars per share)													$ 9.80	$ 9.00	$ 8.20
Accelerated Share Repurchase Agreement
Shareholders Equity [Line Items]
Accelerate Share Repurchase (ASR) authorized amount	$ 500,000,000				$ 350,000,000								$ 500,000,000	$ 350,000,000
Cash paid for repurchases of common stock													$ 500,000,000	$ 350,000,000
Shares received (in shares)	1,400,000				916,249								1,400,000	916,249
Average price paid per share (in dollars per share)														$ 381.99
Retained Earnings
Shareholders Equity [Line Items]
Stock repurchased (in shares)													3,000,000.0
Repurchases of common stock													$ 841,000,000	$ 713,000,000	$ 1,083,000,000
Dividends declared													(2,757,000,000)	(2,550,000,000)	(2,342,000,000)
Additional  Paid-In Capital
Shareholders Equity [Line Items]
Repurchases of common stock													$ 256,000,000	$ 483,000,000	$ 404,000,000