Stockholders' Equity (Deficit) - Narrative (Details)			1 Months Ended		3 Months Ended						9 Months Ended
	Jul. 23, 2021 $ / shares	Jul. 22, 2021 $ / shares	Aug. 31, 2021 shares	May 31, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) vote $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2021 shares	Dec. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 shares	Dec. 31, 2021 USD ($) vote $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 08, 2021 USD ($)	Mar. 31, 2021 USD ($)
Accelerated Share Repurchases [Line Items]
Number of votes per share of common stock permitted on proposals presented to stockholders (vote) | vote					1						1
Dividends declared per common share (in dollars per share) | $ / shares	$ 0.47	$ 0.42			$ 0.47			$ 0.42			$ 1.36	$ 1.25
Shares repurchased					$ 728,000,000			$ 231,000,000			$ 2,008,000,000	$ 500,000,000
Authorized repurchase amount (up to)													$ 4,000,000,000
Authorized amount available for future repurchases					4,800,000,000						4,800,000,000
Other accrued liabilities					$ 4,332,000,000						4,332,000,000			$ 3,987,000,000
Accelerated Share Repurchase
Accelerated Share Repurchases [Line Items]
Shares repurchased				$ 1,000,000,000
Share repurchases (in shares) | shares				5,200,000
Average price of shares repurchased (in usd per share) | $ / shares				$ 193.22
Common stock repurchased (in shares) | shares			900,000	4,300,000						0
Open Market Share Repurchase Transactions
Accelerated Share Repurchases [Line Items]
Average price of shares repurchased (in usd per share) | $ / shares					$ 223.89	$ 203.20		$ 151.12	$ 151.23
Common stock repurchased (in shares) | shares					3,300,000	1,400,000	0	1,500,000	1,800,000
Shares repurchased					$ 728,000,000	$ 280,000,000		$ 231,000,000	$ 269,000,000
Other accrued liabilities					$ 30,000,000						$ 30,000,000