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Long-Term Debt - Senior and Subordinated Debt (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 27, 2022
Jan. 31, 2020
Jul. 26, 2018
Mar. 15, 2016
Mar. 31, 2019
Dec. 31, 2022
Subsidiaries            
Debt Instrument            
Global Bank note program           $ 25,000,000,000
Debt, available for future issuance           $ 20,300,000,000
Subsidiaries | Medium-Term Senior Notes and Subordinated Bank Notes | Minimum            
Debt Instrument            
Debt term           1 year
Subsidiaries | Medium-Term Senior Notes and Subordinated Bank Notes | Maximum            
Debt Instrument            
Debt term           30 years
Subsidiaries | Subordinated Debt | Fixed Rate 3.85% Notes Due 2026            
Debt Instrument            
Principal amount       $ 750,000,000    
Interest rate (as a percent)       3.85%   3.85%
Redemption period prior to maturity date       30 days    
Redemption price (as a percent)       100.00%    
Subsidiaries | Subordinated Debt | Fixed Rate 4.00% Notes Due 2027            
Debt Instrument            
Interest rate (as a percent)         4.00% 4.00%
Redemption price (as a percent)         100.00%  
Issue of senior notes to third party investors         $ 175,000,000  
Subsidiaries | Senior Notes            
Debt Instrument            
Principal amount   $ 1,250,000,000        
Subsidiaries | Senior Notes | Fixed Rate 3.95% Notes Due 2025            
Debt Instrument            
Principal amount     $ 750,000,000      
Interest rate (as a percent)     3.95%     3.95%
Redemption period prior to maturity date     30 days      
Redemption price (as a percent)     100.00%      
Interest rate paid (as a percent)     5.43%      
Subsidiaries | Senior Notes | Fixed Rate 3.95% Notes Due 2025 | LIBOR            
Debt Instrument            
Basis spread on variable rate (as a percent)     1.04%      
Subsidiaries | Senior Notes | Fixed Rate 1.80% Senior Notes Due 2023            
Debt Instrument            
Debt term   3 years        
Principal amount   $ 650,000,000        
Interest rate (as a percent)   1.80%       1.80%
Redemption period prior to maturity date   30 days        
Redemption price (as a percent)   100.00%        
Subsidiaries | Senior Notes | Fixed Rate 2.25% Notes Due 2027            
Debt Instrument            
Debt term   7 years        
Principal amount   $ 600,000,000        
Interest rate (as a percent)   2.25%       2.25%
Redemption price (as a percent)   100.00%        
Parent Company | Senior Notes | Fixed Rate/Floating Rate Senior Notes Due October 2025            
Debt Instrument            
Principal amount $ 1,000,000,000          
Interest rate (as a percent) 5.852%          
Interest rate paid (as a percent)           5.52%
Parent Company | Senior Notes | Fixed Rate/Floating Rate Senior Notes Due October 2025 | Debt Instrument, Redemption, Period One            
Debt Instrument            
Debt instrument, redemption period 1 year          
Parent Company | Senior Notes | Fixed Rate/Floating Rate Senior Notes Due October 2025 | Debt Instrument, Redemption, Period Four            
Debt Instrument            
Debt instrument, redemption period 30 days          
Parent Company | Senior Notes | Fixed Rate/Floating Rate Senior Notes Due October 2025 | SOFR            
Debt Instrument            
Basis spread on variable rate (as a percent) 1.23%          
Parent Company | Senior Notes | Fixed Rate/Floating Rate Senior Notes Due October 2025 | SOFR | Interest rate swaps            
Debt Instrument            
Basis spread on variable rate (as a percent) 1.218%