Earnings Per Share - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended						6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020		Mar. 31, 2020	[1]	Jun. 30, 2021	Jun. 30, 2020	Oct. 21, 2020	Jan. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Remaining share repurchase authority amount		$ 4,600,000,000						$ 4,600,000,000
Payments for shares repurchased		$ 701,000,000		$ 39,000,000				$ 1,252,000,000	$ 616,000,000
Shares received (in shares)		22,000,000		2,000,000				40,000,000	29,000,000
Increase in quarterly dividend percentage	8.00%
Common stock dividends (in dollars per share)		$ 0.093	$ 0.093	$ 0.087	[1]	$ 0.087		$ 0.093
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		$ 228,000,000
Shares received (in shares)		7,000,000
Shares outstanding (in shares)		0						0

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