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Debt and Redeemable Preferred Securities of Subsidiaries (Narrative) (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2020
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Debt Instrument              
Scheduled maturity of long-term debt in 2020       $ 761      
Scheduled maturity of long-term debt in 2021       258      
Scheduled maturity of long-term debt in 2022       310      
Scheduled maturity of long-term debt in 2023       468      
Scheduled maturity of long-term debt in 2024       552      
3.20% Notes Due April 25, 2029              
Debt Instrument              
Face amount of note       $ 700      
Interest rate of note       3.20%      
3.95% Notes due November 1, 2028              
Debt Instrument              
Face amount of note         $ 500    
Interest rate of note         3.95%    
7.50% Notes due November 1, 2018              
Debt Instrument              
Extinguishment of Debt, Amount $ 500            
Gain (Loss) on Extinguishment of Debt $ (24)            
Interest rate of note           7.50% 7.50%
0.625% Notes due September 7, 2024              
Debt Instrument              
Face amount of note | €           € 500  
Interest rate of note           0.625% 0.625%
3.90% Notes due May 4, 2047              
Debt Instrument              
Face amount of note             $ 350
Interest rate of note           3.90% 3.90%
Credit facility expiring 2023              
Debt Instrument              
Revolving credit facility       $ 2,000      
Credit facility expiring 2019              
Debt Instrument              
Revolving credit facility       $ 750      
Scenario, Forecast | 2.875% Notes Due February 7, 2050              
Debt Instrument              
Face amount of note     $ 500        
Interest rate of note   2.875%