Stockholders' Equity - Changes in Common Shares and Treasury Stock (Details) - USD ($)		3 Months Ended
		Mar. 31, 2018		Apr. 02, 2017	Dec. 31, 2017
Class of Stock [Line Items]
Common stock, shares authorized		6,000,000,000			6,000,000,000
Preferred stock, shares authorized		1,000,000,000			1,000,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 810,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued, shares	[1]	501,891,243
Treasury stock, shares	[1]	15,760,782
Stock issued, employee stock purchase plans, shares	[1],[2]	0		0
Stock issued, employee benefit plan, shares	[1]	0		0
Common stock issued, shares	[1]	501,891,243
Treasury stock, shares		17,166,998	[1]	10,562,764
Stock Compensation Plan
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock acquired, shares	[1],[2]	(990,000)		(780,000)
Share Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock acquired, shares	[1]	(2,400,000)		(2,310,000)
December 2016 Share Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,500,000,000.0

[1] Shares may not add due to rounding.

[2] Includes the issuance of shares of common stock and the reissuance of shares from treasury stock in connection with the vesting of employee share-based awards. Treasury stock also includes the reacquisition of shares associated with the vesting of employee share-based awards to satisfy tax withholding requirements. For additional information regarding share-based compensation, see Note 12. Share-Based Payments.