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Debt and Redeemable Preferred Securities of Subsidiaries (Narrative) (Details)
€ in Millions, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
EUR (€)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Debt Instrument                  
Scheduled maturity of long-term debt in 2018   $ 407              
Scheduled maturity of long-term debt in 2019   714              
Scheduled maturity of long-term debt in 2020   760              
Scheduled maturity of long-term debt in 2021   251              
Scheduled maturity of long-term debt in 2022   $ 298              
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%              
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%        
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%      
3.20% 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%  
2.15% Notes due August 15, 2020                  
Debt Instrument                  
Debt issuance date       Aug. 01, 2015          
Face amount of note $ 250                
Debt maturity date       Aug. 15, 2020          
Interest rate of note 2.15%                
3.05% Notes due August 15, 2025                  
Debt Instrument                  
Face amount of note $ 300                
Debt maturity date       Aug. 15, 2025          
Interest rate of note 3.05%                
4.875% Notes due August 15, 2015                  
Debt Instrument                  
Extinguishment of Debt, Amount $ 300                
1.85% Notes due March 1, 2020                  
Debt Instrument                  
Debt issuance date       Feb. 01, 2015          
Face amount of note                 $ 250
Debt maturity date       Mar. 01, 2020          
Interest rate of note                 1.85%
2.65% Notes due March 1, 2025                  
Debt Instrument                  
Face amount of note                 $ 250
Debt maturity date       Mar. 01, 2025          
Interest rate of note                 2.65%
Credit facility expiring 2021                  
Debt Instrument                  
Revolving credit facility   $ 2,000              
Expiration date of revolving credit facility   Jun. 30, 2021