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Long-Term Debt - Senior and Subordinated Debt (Details) - Subsidiaries - USD ($)
12 Months Ended
Jan. 31, 2020
Mar. 22, 2019
Feb. 01, 2019
Jul. 26, 2018
Mar. 15, 2016
Dec. 31, 2021
Debt Instrument            
Global Bank note program           $ 25,000,000,000
Debt, available for future issuance           $ 22,000,000,000
Medium-Term Senior Notes and Subordinated Bank Notes | Lower limit            
Debt Instrument            
Debt term           1 year
Medium-Term Senior Notes and Subordinated Bank Notes | Upper Limit            
Debt Instrument            
Debt term           30 years
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%  
Subordinated Debt | Fixed Rate 4.00% Notes Due 2027            
Debt Instrument            
Interest rate (as a percent)           4.00%
Senior Notes            
Debt Instrument            
Principal amount $ 1,250,000,000          
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)           1.14%
Senior Notes | Fixed Rate 3.95% Notes Due 2025 | LIBOR            
Debt Instrument            
Basis spread on variable rate (as a percent)       1.04%    
Senior Notes | Floating Rate 0.772% Notes Due 2022            
Debt Instrument            
Principal amount     $ 300,000,000      
Interest rate (as a percent)           0.772%
Redemption period prior to maturity date     30 days      
Redemption price (as a percent)     100.00%      
Senior Notes | Floating Rate 0.772% Notes Due 2022 | LIBOR            
Debt Instrument            
Basis spread on variable rate (as a percent)     0.64%      
Senior Notes | Fixed Rate 4.00% Notes Due 2027            
Debt Instrument            
Interest rate (as a percent)   4.00%        
Redemption price (as a percent)   100.00%        
Issue of senior notes to third party investors   $ 175,000,000        
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%          
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%