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Debt (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Long-term debt, fair value $ 8,617 $ 8,410  
Borrowings outstanding 8,090 7,880  
Aggregate maturities of long term debt excluding unamortized discounts, year one 67    
Aggregate maturities of long term debt excluding unamortized discounts, year two 901    
Aggregate maturities of long term debt excluding unamortized discounts, year three 2,185    
Aggregate maturities of long term debt excluding unamortized discounts, year four 1,966    
Aggregate maturities of long term debt excluding unamortized discounts, year five 743    
Cash payments for interest 302 362 $ 334
Senior notes and debentures: | U.S. dollar at 4.75% due 2026      
Debt Instrument [Line Items]      
Borrowings outstanding 865 863  
Senior notes and debentures: | €500 at 2.875% due 2026      
Debt Instrument [Line Items]      
Borrowings outstanding 603 554  
Senior notes and debentures: | €335 at 2.25% due 2023      
Debt Instrument [Line Items]      
Borrowings outstanding 407 372  
Senior notes and debentures: | Euro .75% due 2023      
Debt Instrument [Line Items]      
Borrowings outstanding 666 610  
Term loan facilities | U.S. dollar at LIBOR plus 1.5% due 2024      
Debt Instrument [Line Items]      
Borrowings outstanding 1,023 1,094  
Term loan facilities | Euro at EURIBOR Plus One Point Five Percentage Due Two Thousand and Twenty Four      
Debt Instrument [Line Items]      
Borrowings outstanding 387 $ 504  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Credit facility, available borrowing capacity 1,585    
Line of credit facility, maximum borrowing capacity 1,650    
Outstanding letters of credit $ 65    
Debt covenant, leverage ratio 5.00    
Revolving Credit Facility | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent) 0.00%    
Revolving Credit Facility | Maximum      
Debt Instrument [Line Items]      
Provisions for letters of credit $ 310    
Basis spread on variable rate (as a percent) 1.55%