XML 62 R50.htm IDEA: XBRL DOCUMENT v3.21.2
Debt (Narrative) (Details)
1 Months Ended
Apr. 30, 2021
USD ($)
Tranche
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Commercial paper   $ 0 $ 0
Estimated fair value of long-term debt   12,400,000,000 14,000,000,000.0
Commercial Paper      
Debt Instrument [Line Items]      
Maximum borrowing on lines of credit   5,000,000,000.0  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing on lines of credit   10,000,000,000.0  
Line of credit drawn   $ 0 $ 0
Number of credit facilities | Tranche 2    
Revolving Credit Facility | Credit Facility Due April 2022      
Debt Instrument [Line Items]      
Maximum borrowing on lines of credit $ 4,000,000,000.0    
Revolving Credit Facility | Credit Facility Due July 2023      
Debt Instrument [Line Items]      
Maximum borrowing on lines of credit 4,000,000,000.0    
Revolving Credit Facility | Credit Facility Due April 2026      
Debt Instrument [Line Items]      
Maximum borrowing on lines of credit $ 6,000,000,000.0