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Debt (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 01, 2018
USD ($)
Extension
May 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]              
Face amount         $ 0   $ 0
Debt instrument, covenant, consolidated EBITDA to interest expense ratio, minimum         4.0    
Debt instrument, consolidated EBITDA to interest expense ratio         9.1    
Long-term debt repaid         $ 1,000,000,000 $ 0  
Accrued interest on long-term debt         $ 393,000,000   $ 470,000,000
Senior Notes [Member]              
Debt Instrument [Line Items]              
Long-term debt repaid       $ 1,000,000,000.0      
Senior Notes [Member] | USD Denominated Notes [Member]              
Debt Instrument [Line Items]              
Face amount   $ 2,000,000,000.0          
Senior Notes [Member] | USD Denominated Notes Due 2025 [Member]              
Debt Instrument [Line Items]              
Face amount   $ 750,000,000          
Debt instrument, interest rate, stated percentage   2.35%          
Senior Notes [Member] | USD Denominated Notes Due 2030 [Member]              
Debt Instrument [Line Items]              
Face amount   $ 750,000,000          
Debt instrument, interest rate, stated percentage   3.40%          
Senior Notes [Member] | USD Denominated Notes Due 2050 [Member]              
Debt Instrument [Line Items]              
Face amount   $ 500,000,000          
Debt instrument, interest rate, stated percentage   4.45%          
Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2023 [Member]              
Debt Instrument [Line Items]              
Face amount $ 3,000,000,000.0            
Debt instrument, term 5 years            
Debt instrument, number of extensions | Extension 2            
Debt instrument, extension term 1 year            
Short-term borrowings     $ 3,000,000,000.0        
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2023 [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate         1.00%    
Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt instrument, redemption price, percentage   101.00%