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Debt (Schedule of Debt Outstanding) (Details)
€ in Millions, $ in Millions
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Mar. 31, 2000
USD ($)
Debt Instrument [Line Items]        
Long-term debt $ 15,169   $ 14,948  
Short-term debt 999   0  
Senior Notes        
Debt Instrument [Line Items]        
Long-term debt 15,169   14,948  
Senior Notes | INA Senior Notes Due November 2022 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 1,000      
Long-term debt stated interest rate 2.875% 2.875%    
Long-term debt $ 0   998  
Make Whole Premium Additional Percent 0.20% 0.20%    
Senior Notes | INA Senior Notes Due March 2023 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 475      
Long-term debt stated interest rate 2.70% 2.70%    
Long-term debt $ 474   474  
Make Whole Premium Additional Percent 0.10% 0.10%    
Senior Notes | INA Senior Notes Due May 2024 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 700      
Long-term debt stated interest rate 3.35% 3.35%    
Long-term debt $ 698   698  
Make Whole Premium Additional Percent 0.15% 0.15%    
Senior Notes | INA Senior Notes Due December 2024 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount | €   € 700    
Long-term debt stated interest rate 0.30% 0.30%    
Long-term debt $ 787   841  
Make Whole Premium Additional Percent 0.15% 0.15%    
Senior Notes | INA Senior Notes Due March 2025 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 800      
Long-term debt stated interest rate 3.15% 3.15%    
Long-term debt $ 798   797  
Make Whole Premium Additional Percent 0.15% 0.15%    
Senior Notes | INA Senior Notes Due May 2026 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 1,500      
Long-term debt stated interest rate 3.35% 3.35%    
Long-term debt $ 1,494   1,493  
Make Whole Premium Additional Percent 0.20% 0.20%    
Senior Notes | INA Senior Notes Due June 2027 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount | €   € 575    
Long-term debt stated interest rate 0.875% 0.875%    
Long-term debt $ 645   691  
Make Whole Premium Additional Percent 0.20% 0.20%    
Senior Notes | INA Senior Notes Due March 2028 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount | €   € 900    
Long-term debt stated interest rate 1.55% 1.55%    
Long-term debt $ 1,009   1,079  
Make Whole Premium Additional Percent 0.15% 0.15%    
Senior Notes | INA Senior Notes Due December 2029 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount | €   € 700    
Long-term debt stated interest rate 0.875% 0.875%    
Long-term debt $ 785   840  
Make Whole Premium Additional Percent 0.20% 0.20%    
Senior Notes | INA Senior Notes Due September 2030 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 1,000      
Long-term debt stated interest rate 1.375% 1.375%    
Long-term debt $ 992   991  
Make Whole Premium Additional Percent 0.15% 0.15%    
Senior Notes | INA Senior Notes Due June 2031 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount | €   € 575    
Long-term debt stated interest rate 1.40% 1.40%    
Long-term debt $ 642   687  
Make Whole Premium Additional Percent 0.25% 0.25%    
Senior Notes | INA Senior Notes Due May 2036 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 300      
Long-term debt stated interest rate 6.70% 6.70%    
Long-term debt $ 298   298  
Make Whole Premium Additional Percent 0.20% 0.20%    
Senior Notes | INA Senior Notes Due May 2037 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 800      
Long-term debt stated interest rate 6.00% 6.00%    
Long-term debt $ 936   945  
Make Whole Premium Additional Percent 0.20% 0.20%    
Senior Notes | INA Senior Notes Due March 2038 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount | €   € 900    
Long-term debt stated interest rate 2.50% 2.50%    
Long-term debt $ 1,007   1,077  
Make Whole Premium Additional Percent 0.25% 0.25%    
Senior Notes | INA Senior Notes Due May 2038 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 600      
Long-term debt stated interest rate 6.50% 6.50%    
Long-term debt $ 735   743  
Make Whole Premium Additional Percent 0.30% 0.30%    
Senior Notes | INA Senior Notes Due March 2043 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 475      
Long-term debt stated interest rate 4.15% 4.15%    
Long-term debt $ 470   470  
Make Whole Premium Additional Percent 0.15% 0.15%    
Senior Notes | INA Senior Notes Due November 2045 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 1,500      
Long-term debt stated interest rate 4.35% 4.35%    
Long-term debt $ 1,485   1,484  
Make Whole Premium Additional Percent 0.25% 0.25%    
Senior Notes | INA Senior Notes Due December 2051 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 600      
Long-term debt stated interest rate 2.85% 2.85%    
Long-term debt $ 593   0  
Make Whole Premium Additional Percent 0.15% 0.15%    
Senior Notes | INA Senior Notes Due December 2061 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 1,000      
Long-term debt stated interest rate 3.05% 3.05%    
Long-term debt $ 983   0  
Make Whole Premium Additional Percent 0.20% 0.20%    
Trust Preferred Securities | Chubb INA Capital Securities Due 2030 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 309     $ 300
Long-term debt stated interest rate 9.70% 9.70%   9.70%
Trust preferred securities $ 308   308  
Unsecured Debt | INA Senior Notes Due August 2029 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 100      
Long-term debt stated interest rate 8.875% 8.875%    
Long-term debt $ 100   100  
Unsecured Debt | INA Senior Notes Due November 2031 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 200      
Long-term debt stated interest rate 6.80% 6.80%    
Long-term debt $ 238   $ 242  
Make Whole Premium Additional Percent 0.25% 0.25%    
Repurchase agreements        
Debt Instrument [Line Items]        
Weighted average interest rate on short-term debt 0.20% 0.20% 0.30%  
Short-term debt $ 1,406   $ 1,405  
Senior Notes | INA Senior Notes Due November 2022 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 1,000      
Long-term debt stated interest rate 2.875% 2.875%    
Make Whole Premium Additional Percent 0.20% 0.20%    
Short-term debt $ 999   $ 0