Shareholders' Equity - Summary of Perpetual Preferred Stock Issued and Outstanding (Detail) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares
Class of Stock [Line Items]
Shares Authorized (in shares)	472,700
Shares Issued (in shares)	400,282
Shares Outstanding (in shares)	400,280
Redemption Value ($ in millions) | $	$ 10,703
Series A Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	50,000
Shares Issued (in shares)	30,000
Shares Outstanding (in shares)	29,999
Depositary Shares Per Share (in shares)	1,000
Earliest Redemption Date	Currently redeemable
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 750
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series C Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	25,000
Shares Issued (in shares)	8,000
Shares Outstanding (in shares)	8,000
Depositary Shares Per Share (in shares)	1,000
Earliest Redemption Date	Currently redeemable
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 200
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series D Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	60,000
Shares Issued (in shares)	54,000
Shares Outstanding (in shares)	53,999
Depositary Shares Per Share (in shares)	1,000
Earliest Redemption Date	Currently redeemable
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 1,350
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series E Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	17,500
Shares Issued (in shares)	7,667
Shares Outstanding (in shares)	7,667
Earliest Redemption Date	Currently redeemable
Liquidation Preference (in dollars per share) | $ / shares	$ 100,000
Redemption Value ($ in millions) | $	$ 767
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series F Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	5,000
Shares Issued (in shares)	1,615
Shares Outstanding (in shares)	1,615
Earliest Redemption Date	Currently redeemable
Liquidation Preference (in dollars per share) | $ / shares	$ 100,000
Redemption Value ($ in millions) | $	$ 161
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series J Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	46,000
Shares Issued (in shares)	40,000
Shares Outstanding (in shares)	40,000
Depositary Shares Per Share (in shares)	1,000
Earliest Redemption Date	May 10, 2023
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 1,000
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series K Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	32,200
Shares Issued (in shares)	28,000
Shares Outstanding (in shares)	28,000
Depositary Shares Per Share (in shares)	1,000
Earliest Redemption Date	May 10, 2024
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 700
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series O Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	26,000
Shares Issued (in shares)	26,000
Shares Outstanding (in shares)	26,000
Depositary Shares Per Share (in shares)	25
Earliest Redemption Date	Nov. 10, 2026
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 650
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series P Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	66,000
Shares Issued (in shares)	60,000
Shares Outstanding (in shares)	60,000
Depositary Shares Per Share (in shares)	25
Earliest Redemption Date	Nov. 10, 2022
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 1,500
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series Q Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	20,000
Shares Issued (in shares)	20,000
Shares Outstanding (in shares)	20,000
Depositary Shares Per Share (in shares)	25
Earliest Redemption Date	Aug. 10, 2024
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 500
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series R Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	24,000
Shares Issued (in shares)	24,000
Shares Outstanding (in shares)	24,000
Depositary Shares Per Share (in shares)	25
Earliest Redemption Date	Feb. 10, 2025
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 600
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series S Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	14,000
Shares Issued (in shares)	14,000
Shares Outstanding (in shares)	14,000
Depositary Shares Per Share (in shares)	25
Earliest Redemption Date	Feb. 10, 2025
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 350
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series T Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	27,000
Shares Issued (in shares)	27,000
Shares Outstanding (in shares)	27,000
Depositary Shares Per Share (in shares)	25
Earliest Redemption Date	May 10, 2026
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 675
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series U Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	30,000
Shares Issued (in shares)	30,000
Shares Outstanding (in shares)	30,000
Depositary Shares Per Share (in shares)	25
Earliest Redemption Date	Aug. 10, 2026
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 750
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01
Series V Preferred Stock
Class of Stock [Line Items]
Shares Authorized (in shares)	30,000
Shares Issued (in shares)	30,000
Shares Outstanding (in shares)	30,000
Depositary Shares Per Share (in shares)	25
Earliest Redemption Date	Nov. 10, 2026
Liquidation Preference (in dollars per share) | $ / shares	$ 25,000
Redemption Value ($ in millions) | $	$ 750
Par value on preferred stock (in dollars per share) | $ / shares	$ 0.01