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Debt (Schedule of Debt Outstanding) (Details)
€ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Mar. 31, 2000
USD ($)
Debt Instrument [Line Items]        
Short-term debt $ 0   $ 1,299  
Long-term debt 14,948   13,559  
Trust preferred securities 308   308  
Senior Notes        
Debt Instrument [Line Items]        
Long-term debt 14,948   13,559  
Senior Notes | INA Senior Notes Due November 2022 [Member]        
Debt Instrument [Line Items]        
Long-term debt 998   997  
Debt Instrument, Face Amount $ 1,000      
Long-term debt stated interest rate 2.875% 2.875%    
Make Whole Premium Additional Percent 20.00% 20.00%    
Senior Notes | INA Senior Notes Due March 2023 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 474   473  
Debt Instrument, Face Amount $ 475      
Long-term debt stated interest rate 2.70% 2.70%    
Make Whole Premium Additional Percent 10.00% 10.00%    
Senior Notes | INA Senior Notes Due May 2024 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 698   697  
Debt Instrument, Face Amount $ 700      
Long-term debt stated interest rate 3.35% 3.35%    
Make Whole Premium Additional Percent 15.00% 15.00%    
Senior Notes | INA Senior Notes Due December 2024 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 841   776  
Debt Instrument, Face Amount | €   € 700    
Long-term debt stated interest rate 0.30% 0.30%    
Make Whole Premium Additional Percent 15.00% 15.00%    
Senior Notes | INA Senior Notes Due March 2025 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 797   796  
Debt Instrument, Face Amount $ 800      
Long-term debt stated interest rate 3.15% 3.15%    
Make Whole Premium Additional Percent 15.00% 15.00%    
Senior Notes | INA Senior Notes Due May 2026 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 1,493   1,492  
Debt Instrument, Face Amount $ 1,500      
Long-term debt stated interest rate 3.35% 3.35%    
Make Whole Premium Additional Percent 20.00% 20.00%    
Senior Notes | INA Senior Notes Due June 2027 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 691   635  
Debt Instrument, Face Amount | €   € 575    
Long-term debt stated interest rate 0.875% 0.875%    
Make Whole Premium Additional Percent 20.00% 20.00%    
Senior Notes | INA Senior Notes Due March 2028 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 1,079   993  
Debt Instrument, Face Amount | €   € 900    
Long-term debt stated interest rate 1.55% 1.55%    
Make Whole Premium Additional Percent 15.00% 15.00%    
Senior Notes | INA Senior Notes Due December 2029 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 840   775  
Debt Instrument, Face Amount | €   € 700    
Long-term debt stated interest rate 0.875% 0.875%    
Make Whole Premium Additional Percent 20.00% 20.00%    
Senior Notes | INA Senior Notes Due September 2030        
Debt Instrument [Line Items]        
Long-term debt $ 991   0  
Debt Instrument, Face Amount $ 1,000      
Long-term debt stated interest rate 1.375% 1.375%    
Make Whole Premium Additional Percent 15.00% 15.00%    
Senior Notes | INA Senior Notes Due June 2031 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 687   633  
Debt Instrument, Face Amount | €   € 575    
Long-term debt stated interest rate 1.40% 1.40%    
Make Whole Premium Additional Percent 25.00% 25.00%    
Senior Notes | INA Senior Notes Due November 2031        
Debt Instrument [Line Items]        
Make Whole Premium Additional Percent 25.00% 25.00%    
Senior Notes | INA Senior Notes Due May 2036 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 298   297  
Debt Instrument, Face Amount $ 300      
Long-term debt stated interest rate 6.70% 6.70%    
Make Whole Premium Additional Percent 20.00% 20.00%    
Senior Notes | INA Senior Notes Due May 2037 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 945   953  
Debt Instrument, Face Amount $ 800      
Long-term debt stated interest rate 6.00% 6.00%    
Make Whole Premium Additional Percent 20.00% 20.00%    
Senior Notes | INA Senior Notes Due March 2038 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 1,077   992  
Debt Instrument, Face Amount | €   € 900    
Long-term debt stated interest rate 2.50% 2.50%    
Make Whole Premium Additional Percent 25.00% 25.00%    
Senior Notes | INA Senior Notes Due May 2038 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 743   751  
Debt Instrument, Face Amount $ 600      
Long-term debt stated interest rate 6.50% 6.50%    
Make Whole Premium Additional Percent 30.00% 30.00%    
Senior Notes | INA Senior Notes Due March 2043 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 470   470  
Debt Instrument, Face Amount $ 475      
Long-term debt stated interest rate 4.15% 4.15%    
Make Whole Premium Additional Percent 15.00% 15.00%    
Senior Notes | INA Senior Notes Due November 2045 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 1,484   1,483  
Debt Instrument, Face Amount $ 1,500      
Long-term debt stated interest rate 4.35% 4.35%    
Make Whole Premium Additional Percent 25.00% 25.00%    
Trust Preferred Securities | INA capital securities due 2030        
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]        
Long-term debt 100   100  
Debt Instrument, Face Amount $ 100      
Long-term debt stated interest rate 8.875% 8.875%    
Unsecured Debt | INA Senior Notes Due November 2031        
Debt Instrument [Line Items]        
Long-term debt $ 242   246  
Debt Instrument, Face Amount $ 200      
Long-term debt stated interest rate 6.80% 6.80%    
Repurchase agreements        
Debt Instrument [Line Items]        
Short-term debt $ 1,405   $ 1,416  
Weighted average interest rate on short-term debt 0.30% 0.30% 2.20%  
Senior Notes | INA Senior Notes Due November 2020 [Member]        
Debt Instrument [Line Items]        
Short-term debt $ 0   $ 1,298  
Debt Instrument, Face Amount $ 1,300      
Long-term debt stated interest rate 2.30% 2.30%    
Make Whole Premium Additional Percent 15.00% 15.00%    
Senior Notes | Other Short Term Debt due September 2020 [Member]        
Debt Instrument [Line Items]        
Short-term debt $ 0   $ 1  
Long-term debt stated interest rate 2.75% 2.75%