Earnings Per Share - Narrative (Details)			1 Months Ended	3 Months Ended										9 Months Ended
	Jun. 28, 2021 $ / shares	Jun. 04, 2021	Mar. 31, 2021	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2021 $ / shares	Mar. 31, 2021 $ / shares	Sep. 30, 2020 USD ($) $ / shares shares		Jun. 30, 2020 $ / shares	[1]	Mar. 31, 2020 $ / shares	[1]	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($) shares	Oct. 21, 2020 USD ($)	Jan. 31, 2019 USD ($)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Remaining share repurchase authority amount				$ 3,600,000,000	$ 3,600,000,000									$ 3,600,000,000
Payments for shares repurchased					$ 1,064,000,000			$ 48,000,000						$ 2,316,000,000	$ 664,000,000
Shares received (in shares) | shares					34,000,000			2,000,000						74,000,000	31,000,000
Increase in quarterly dividend percentage			8.00%
Common stock dividends (in dollars per share) | $ / shares	$ 0.28			$ 0.093	$ 0.093	$ 0.093	$ 0.093	$ 0.087	[1]	$ 0.087		$ 0.087
Stock split conversion ratio	3	3
January 2019 program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share repurchase program amount																	$ 5,000,000,000
October 2020 program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share repurchase program amount																$ 5,000,000,000
Structured Agreements
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Payments for shares repurchased					$ 150,000,000									$ 378,000,000
Shares received (in shares) | shares					5,000,000									12,000,000
Shares outstanding (in shares) | shares				0	0									0

[1] All prior period share and per share data has been retroactively adjusted to reflect the stock split effective June 28, 2021. Certain prior year data has been reclassified to conform to the current presentation.