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Credit Facilities and Restrictive Covenants (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]    
Current portion of debt $ 2,477 $ 3,388
$500 million, 364-day credit facility expired November 15, 2019    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity   $ 500
Debt Instrument, Term   364 days
$4 billion credit facility due November 16, 2023    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 4,000  
Maximum ratio of consolidated total funded debt to consolidated earnings before interest income taxes DDA 5.50  
Letters of Credit Outstanding, Amount $ 84  
Remaining borrowing capacity $ 3,900  
$4 billion credit facility due November 16, 2023 | Minimum    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.10%  
$4 billion credit facility due November 16, 2023 | Maximum    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.30%  
$4 billion credit facility due November 16, 2023 | LIBOR Alternate Base Rate | Minimum    
Line of Credit Facility [Line Items]    
Debt Instrument, 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]    
Debt Instrument, 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]    
Debt Instrument, 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]    
Debt Instrument, Basis Spread on Variable Rate 2.00%  
$4 billion credit facility due November 16, 2023 | Federal Funds Rate    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.50%  
$4 billion credit facility due November 16, 2023 | Eurodollar    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.00%  
Commercial Paper    
Line of Credit Facility [Line Items]    
Commercial Paper, Maximum Borrowing Capacity $ 4,000  
Debt Instrument, Term 270 days  
Current portion of debt $ 37 $ 433