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Debt - Credit Facilities and Restrictive Covenants (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]    
Current portion of debt $ 2,558 $ 2,477
$4 billion credit facility due November 16, 2023    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 4,000  
Remaining borrowing capacity $ 3,900  
Maximum ratio of consolidated total funded debt to consolidated earnings before interest income taxes DDA 5.50  
Current portion of debt $ 0 0
Letters of credit outstanding $ 82  
$4 billion credit facility due November 16, 2023 | Minimum    
Line of Credit Facility [Line Items]    
Standby fee rate 0.10%  
$4 billion credit facility due November 16, 2023 | Maximum    
Line of Credit Facility [Line Items]    
Standby fee rate 0.30%  
$4 billion credit facility due November 16, 2023 | LIBOR Alternate Base Rate | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.10%  
$4 billion credit facility due November 16, 2023 | LIBOR Alternate Base Rate | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.00%  
$4 billion credit facility due November 16, 2023 | London Interbank Offered Rate (LIBOR) | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.00%  
$4 billion credit facility due November 16, 2023 | London Interbank Offered Rate (LIBOR) | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.00%  
$4 billion credit facility due November 16, 2023 | Federal Funds Rate    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.50%  
$4 billion credit facility due November 16, 2023 | Eurodollar    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.00%  
Commercial Paper    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 4,000  
Debt term 270 days  
Current portion of debt $ 0 $ 37