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Debt and Redeemable Preferred Securities of Subsidiaries (Narrative) (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Debt Instrument          
Scheduled maturity of long-term debt in 2019 $ 716        
Scheduled maturity of long-term debt in 2020 758        
Scheduled maturity of long-term debt in 2021 256        
Scheduled maturity of long-term debt in 2022 304        
Scheduled maturity of long-term debt in 2023 $ 464        
3.95% Notes due November 1, 2028          
Debt Instrument          
Debt issuance date Oct. 24, 2018        
Face amount of note $ 500        
Debt maturity date Nov. 01, 2028        
Interest rate of note 3.95%        
7.50% Notes due November 1, 2018          
Debt Instrument          
Debt Instrument, Repurchase Date   Dec. 14, 2017      
Extinguishment of Debt, Amount   $ 500      
Debt maturity date   Nov. 01, 2018      
Gain (Loss) on Extinguishment of Debt   $ (24)      
Interest rate of note       7.50% 7.50%
0.625% Notes due September 7, 2024          
Debt Instrument          
Debt issuance date   Sep. 30, 2017      
Face amount of note | €       € 500  
Debt maturity date   Sep. 07, 2024      
Interest rate of note       0.625% 0.625%
3.90% Notes due May 4, 2047          
Debt Instrument          
Debt issuance date   May 30, 2017      
Face amount of note         $ 350
Debt maturity date   May 04, 2047      
Interest rate of note       3.90% 3.90%
3.20% Notes due July 30, 2046          
Debt Instrument          
Debt issuance date     Jul. 29, 2016    
Face amount of note     $ 500    
Debt maturity date     Jul. 30, 2046    
Interest rate of note     3.20%    
1.40% Notes due February 15, 2019          
Debt Instrument          
Debt issuance date     Feb. 22, 2016    
Face amount of note     $ 400    
Debt maturity date     Feb. 15, 2019    
Interest rate of note     1.40%    
2.75% Notes due February 15, 2026          
Debt Instrument          
Face amount of note     $ 400    
Debt maturity date     Feb. 15, 2026    
Interest rate of note     2.75%    
Credit facility expiring 2023          
Debt Instrument          
Revolving credit facility $ 2,000        
Expiration date of revolving credit facility Jun. 30, 2023        
Credit facility expiring 2019          
Debt Instrument          
Revolving credit facility $ 500        
Expiration date of revolving credit facility Jun. 30, 2019        
Credit facility replaced in 2018          
Debt Instrument          
Revolving credit facility $ 2,000