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Financing (Commercial Paper Programs And Credit Facilities) (Narrative) (Details)
10 Months Ended 56 Months Ended
Dec. 31, 2019
USD ($)
Aug. 27, 2019
USD ($)
Nov. 06, 2018
USD ($)
Aug. 27, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2015
USD ($)
Line of Credit Facility [Line Items]            
Debt discounts, premiums and debt issuance costs $ 112,000,000       $ 19,000,000  
Commercial paper            
Line of Credit Facility [Line Items]            
Debt, weighted average annual interest rate, basis points (0.20%)          
Long-term debt weighted average maturity 63 days          
Euro-denominated commercial paper | Commercial paper            
Line of Credit Facility [Line Items]            
Long-term debt, commerical paper $ 5,000,000,000.0          
Revolving credit facility | Superseded Credit Facility | Long-term debt            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity           $ 4,000,000,000.0
Revolving credit facility | Superseded Credit Facility | Short-term debt            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum amount outstanding during period       $ 0    
Revolving credit facility | Superseded 364-Day Facility [Member] | Short-term debt            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity         $ 1,000,000,000.0  
Line of credit facility, maximum amount outstanding during period     $ 0      
Revolving credit facility | Five-Year Facility | Long-term debt            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity   $ 5,000,000,000.0   5,000,000,000.0    
Additional borrowing capacity   $ 2,500,000,000   2,500,000,000    
Revolving credit facility | Five-Year Facility | Long-term debt | Federal funds rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.50%        
Revolving credit facility | Five-Year Facility | Long-term debt | Eurodollar            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.00%        
Revolving credit facility | Five-Year Facility | Minimum | Long-term debt            
Line of Credit Facility [Line Items]            
Commitment fee, percent   0.04%        
Revolving credit facility | Five-Year Facility | Minimum | Long-term debt | LIBOR-based rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.585%        
Revolving credit facility | Five-Year Facility | Maximum | Long-term debt            
Line of Credit Facility [Line Items]            
Commitment fee, percent   0.125%        
Revolving credit facility | Five-Year Facility | Maximum | Long-term debt | LIBOR-based rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.00%        
Revolving credit facility | 364-Day Facility | Short-term debt            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity   $ 5,000,000,000.0   $ 5,000,000,000.0    
Conversion fee, percent   0.75%        
Revolving credit facility | 364-Day Facility | Short-term debt | Federal funds rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.50%        
Revolving credit facility | 364-Day Facility | Short-term debt | Eurodollar            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.00%        
Revolving credit facility | 364-Day Facility | Minimum | Short-term debt            
Line of Credit Facility [Line Items]            
Commitment fee, percent   0.03%        
Revolving credit facility | 364-Day Facility | Minimum | Short-term debt | LIBOR-based rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.595%        
Revolving credit facility | 364-Day Facility | Maximum | Short-term debt            
Line of Credit Facility [Line Items]            
Commitment fee, percent   0.12%        
Revolving credit facility | 364-Day Facility | Maximum | Short-term debt | LIBOR-based rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.005%        
Revolving credit facility | 2020 Credit Facilities            
Line of Credit Facility [Line Items]            
Credit facility, borrowings outstanding $ 0          
Revolving credit facility | 2020 Credit Facilities | Minimum | Long-term debt            
Line of Credit Facility [Line Items]            
Debt instrument, covenants, leverage ratio   0.65   0.65    
Revolving credit facility | 2020 Credit Facilities | Maximum | Long-term debt            
Line of Credit Facility [Line Items]            
Debt instrument, covenants, leverage ratio   1   1