v3.21.2
Shareholders' Equity - Summary of Perpetual Preferred Stock Issued and Outstanding (Detail)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Class of Stock [Line Items]  
Shares Authorized 442,700
Shares Issued 370,282
Shares Outstanding 370,280
Redemption Value | $ $ 9,953
Series A Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 50,000
Shares Issued 30,000
Shares Outstanding 29,999
Depositary Shares Per Share 1,000
Earliest Redemption Date Currently redeemable
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 750
Dividend rate 3 month LIBOR + 0.75%, with floor of 3.75%, payable quarterly
Series C Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 25,000
Shares Issued 8,000
Shares Outstanding 8,000
Depositary Shares Per Share 1,000
Earliest Redemption Date Currently redeemable
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 200
Dividend rate 3 month LIBOR + 0.75%, with floor of 4.00%, payable quarterly
Series D Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 60,000
Shares Issued 54,000
Shares Outstanding 53,999
Depositary Shares Per Share 1,000
Earliest Redemption Date Currently redeemable
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 1,350
Dividend rate 3 month LIBOR + 0.67%, with floor of 4.00%, payable quarterly
Series E Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 17,500
Shares Issued 7,667
Shares Outstanding 7,667
Earliest Redemption Date Currently redeemable
Liquidation Preference | $ / shares $ 100,000
Redemption Value | $ $ 767
Dividend rate 3 month LIBOR + 0.7675%, with floor of 4.00%, payable quarterly
Series F Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 5,000
Shares Issued 1,615
Shares Outstanding 1,615
Earliest Redemption Date Currently redeemable
Liquidation Preference | $ / shares $ 100,000
Redemption Value | $ $ 161
Dividend rate 3 month LIBOR + 0.77%, with floor of 4.00%, payable quarterly
Series J Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 46,000
Shares Issued 40,000
Shares Outstanding 40,000
Depositary Shares Per Share 1,000
Earliest Redemption Date May 10, 2023
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 1,000
Dividend rate 5.50% to, but excluding, May 10, 2023; 3 month LIBOR + 3.64% thereafter, payable quarterly
Series K Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 32,200
Shares Issued 28,000
Shares Outstanding 28,000
Depositary Shares Per Share 1,000
Earliest Redemption Date May 10, 2024
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 700
Dividend rate 6.375% to, but excluding, May 10, 2024; 3 month LIBOR + 3.55% thereafter, payable quarterly
Series O Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 26,000
Shares Issued 26,000
Shares Outstanding 26,000
Depositary Shares Per Share 25
Earliest Redemption Date Nov. 10, 2026
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 650
Dividend rate 5.30%, payable semi-annually, from issuance date to, but excluding, November 10, 2026; 3 month LIBOR + 3.834%, payable quarterly, thereafter
Series P Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 66,000
Shares Issued 60,000
Shares Outstanding 60,000
Depositary Shares Per Share 25
Earliest Redemption Date Nov. 10, 2022
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 1,500
Dividend rate 5.00%, payable semi-annually, from issuance date to, but excluding, November 10, 2022; 3 month LIBOR + 2.874%, payable quarterly, thereafter
Series Q Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 20,000
Shares Issued 20,000
Shares Outstanding 20,000
Depositary Shares Per Share 25
Earliest Redemption Date Aug. 10, 2024
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 500
Dividend rate 5.50%, payable semi-annually, from issuance date to, but excluding, August 10, 2024; 5 year treasury rate + 3.623%, payable semi-annually, thereafter
Series R Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 24,000
Shares Issued 24,000
Shares Outstanding 24,000
Depositary Shares Per Share 25
Earliest Redemption Date Feb. 10, 2025
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 600
Dividend rate 4.95%, payable semi-annually, from issuance date to, but excluding, February 10, 2025; 5 year treasury rate + 3.224%, payable semi-annually, thereafter
Series S Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 14,000
Shares Issued 14,000
Shares Outstanding 14,000
Depositary Shares Per Share 25
Earliest Redemption Date Feb. 10, 2025
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 350
Dividend rate 4.40%, payable semi-annually, from issuance date to, but excluding, February 10, 2025; 5 year treasury rate + 2.85%, payable semi-annually thereafter
Series T Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 27,000
Shares Issued 27,000
Shares Outstanding 27,000
Depositary Shares Per Share 25
Earliest Redemption Date May 10, 2026
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 675
Dividend rate 3.80%, payable semi-annually, from issuance date to, but excluding, May 10, 2026; 5 year treasury rate + 2.969%, payable semi-annually, thereafter
Series U Preferred Stock [Member]  
Class of Stock [Line Items]  
Shares Authorized 30,000
Shares Issued 30,000
Shares Outstanding 30,000
Depositary Shares Per Share 25
Earliest Redemption Date Aug. 10, 2026
Liquidation Preference | $ / shares $ 25,000
Redemption Value | $ $ 750
Dividend rate 3.65%, payable semi-annually, from issuance date to, but excluding, August 10, 2026; 5 year treasury rate + 2.915%, payable semi-annually, thereafter