Stockholders' Equity, Comprehensive Income and Share-Based Compensation - Additional Information (Details) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 $ / shares	May 02, 2021 USD ($) $ / shares shares	Apr. 26, 2020 $ / shares shares	May 02, 2021 USD ($) employee_stock_purchase_plan $ / shares shares	Apr. 26, 2020 USD ($) $ / shares shares	Sep. 01, 2021 shares	Mar. 11, 2021 shares
Equity [Line Items]
Tax effects on the unrealized loss on derivative instruments qualifying as cash flow hedges | $					$ 0	$ 39,000,000
Amount authorized by board of directors to repurchase shares | $	$ 7,500,000,000
Remaining authorized repurchase amount | $			$ 8,000,000,000.0		$ 8,000,000,000.0
Dividends declared per share (in dollars per share) | $ / shares	$ 0.24	$ 0.22	$ 0.24	$ 0.22	$ 0.46	$ 0.43
Payments of dividends | $					$ 403,000,000	$ 385,000,000
2018 Stock Repurchase Program
Equity [Line Items]
Remaining authorized repurchase amount | $			$ 525,000,000		$ 525,000,000
Employee Stock
Equity [Line Items]
Performance of total shareholder return					100.00%
Total unrecognized compensation expense | $			$ 592,000,000		$ 592,000,000
Weighted average period for unrecognized compensation expense to be recognized (in years)					2 years 9 months 18 days
Performance Shares
Equity [Line Items]
Additional performance-based awards to be earned upon certain levels of achievement (in shares) | shares			1.3		1.3
Award measurement metric relative weight					50.00%
Award measurement period					3 years
Performance Shares | Executive Officers
Equity [Line Items]
Award measurement period					5 years
Performance Shares | Minimum
Equity [Line Items]
Award vesting rights, percentage of target amount					0.00%
Performance Shares | Minimum | Executive Officers
Equity [Line Items]
Award vesting rights, percentage of target amount					0.00%
Performance Shares | Maximum
Equity [Line Items]
Award vesting rights, percentage of target amount					200.00%
Performance Shares | Maximum | Executive Officers
Equity [Line Items]
Award vesting rights, percentage of target amount					200.00%
Employee Stock Incentive Plan
Equity [Line Items]
Increase in capital shares reserved for future issuance (in shares) | shares								10.0
Number of shares available for grant (in shares) | shares			34.0		34.0
Employee Stock Purchase Plan
Equity [Line Items]
Number of employee stock purchase plans | employee_stock_purchase_plan					2
Shares issued under employee stock purchase plans (in shares) | shares			2.0	2.0	2.0	2.0
Number of shares available for grant (in shares) | shares			8.0		8.0
Employee stock purchase plan purchase period					6 months
Employee Stock Purchase Plan | Forecast
Equity [Line Items]
Increase in capital shares reserved for future issuance (in shares) | shares							11.3
Employee Stock Purchase Plan | Employee Stock
Equity [Line Items]
Purchase price of common stock					85.00%
United States | Employee Stock Purchase Plan
Equity [Line Items]
Number of employee stock purchase plans | employee_stock_purchase_plan					1
Non-US | Employee Stock Purchase Plan
Equity [Line Items]
Number of employee stock purchase plans | employee_stock_purchase_plan					1