Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Preferred Stock (Details)

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Shareholders' Equity - Preferred Stock (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 25, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Class of Stock [Line Items]            
Preferred stock dividends   $ 260 $ 490 $ 249 $ 750 $ 718
Series EE Preferred Stock            
Class of Stock [Line Items]            
Redeemed preferred stock $ 900