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Debt - Revolving Credit and Letter of Credit (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Banks
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]      
Debt covenant compliance The Company was in compliance with its debt covenants as of December 31, 2019.    
Repayment of long-term debt $ 4,491 $ 131 $ 1,250
Repayment of short-term debt 681 (1,487) $ (80)
Repayment of outstanding obligations 5,200    
$3,000 million Floating Rate Term Loan due 2021 [Member]      
Line of Credit Facility [Line Items]      
Aggregate principal amount 3,000    
Repayment of long-term debt 3,000    
$349 million, 4.125% Notes due 2020 [Member]      
Line of Credit Facility [Line Items]      
Aggregate principal amount 349 $ 500  
Repayment of long-term debt 151    
Long Term Debt Current Maturities Paid [Member]      
Line of Credit Facility [Line Items]      
Repayment of long-term debt $ 1,300    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Leverage ratio covenant 60.00%    
Revolving Credit Facility [Member] | Revolving Credit And Letter Of Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Number of participating banks | Banks 23    
Expiration date Apr. 06, 2023    
Maximum borrowing capacity $ 3,250    
Amount by which credit facilty amount can be increased $ 500    
Revolving Credit Facility [Member] | 364-day Revolving Credit Agreement [Member]      
Line of Credit Facility [Line Items]      
Number of participating banks | Banks 23    
Credit agreement term 364 days    
Maximum borrowing capacity $ 1,000    
Letter of Credit [Member] | Revolving Credit And Letter Of Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 500    
Letters of credit outstanding 10    
Term Loan Credit Agreement [Member]      
Line of Credit Facility [Line Items]      
Aggregate principal amount $ 3,000