Subsequent Events (Details) - USD ($)						3 Months Ended		6 Months Ended
		Jul. 12, 2021	Jul. 02, 2021	Jun. 02, 2021	Apr. 22, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jan. 11, 2021
Subsequent Event [Line Items]
Cash dividends declared per common share (in dollars per share)	[1],[2]					$ 0.19	$ 0.19	$ 0.38	$ 0.38
Trust preferred securities redemption								$ 1,442,000,000	$ 0
Preferred stock issuance								$ 2,326,000,000	$ 0
Common stock
Subsequent Event [Line Items]
Cash dividends declared per common share (in dollars per share)						$ 0.19
Stock repurchase program, authorized amount										$ 1,600,000,000
Trust Preferred Securities Subject to Mandatory Redemption
Subsequent Event [Line Items]
Trust preferred securities redemption					$ 1,400,000,000
Debt redeemed during period, number of shares					56,000,000
Series C Preferred Stock
Subsequent Event [Line Items]
Preferred stock issuance				$ 1,000,000,000.0
Subsequent event | Common stock
Subsequent Event [Line Items]
Dividends payable, date declared		Jul. 12, 2021
Cash dividends declared per common share (in dollars per share)		$ 0.25
Dividends payable, date to be paid		Aug. 16, 2021
Dividends payable, date of record		Aug. 02, 2021
Stock repurchase program, authorized amount		$ 2,000,000,000.0
Subsequent event | Trust Preferred Securities Subject to Mandatory Redemption
Subsequent Event [Line Items]
Trust preferred securities redemption			$ 1,040,000,000.00
Debt redeemed during period, number of shares			41,600,000

[1] Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share.

[2] Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.