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Debt and Borrowing Arrangements - Tender Offers (Details) - Loans Payable - USD ($)
$ in Millions
Oct. 16, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Amount Repurchased $ 950  
3.625% Notes Due May 2023    
Debt Instrument [Line Items]    
Interest Rate 3.625%  
Amount Repurchased $ 359  
4.000% Notes Due February 2024    
Debt Instrument [Line Items]    
Interest Rate 4.00%  
Amount Repurchased $ 203  
3.625% Notes Due February 2026    
Debt Instrument [Line Items]    
Interest Rate 3.625% 3.625%
Amount Repurchased $ 249  
4.125% Notes Due May 2028    
Debt Instrument [Line Items]    
Interest Rate 4.125%  
Amount Repurchased $ 27  
6.500% Notes Due November 2031    
Debt Instrument [Line Items]    
Interest Rate 6.50%  
Amount Repurchased $ 5  
7.000% Notes Due August 2037    
Debt Instrument [Line Items]    
Interest Rate 7.00%  
Amount Repurchased $ 1  
6.875% Notes Due February 2038    
Debt Instrument [Line Items]    
Interest Rate 6.875%  
Amount Repurchased $ 24  
6.875% Notes Due January 2039    
Debt Instrument [Line Items]    
Interest Rate 6.875%  
Amount Repurchased $ 10  
6.500% Notes Due February 2040    
Debt Instrument [Line Items]    
Interest Rate 6.50%  
Amount Repurchased $ 1  
4.625% Notes Due May 2048    
Debt Instrument [Line Items]    
Interest Rate 4.625%  
Amount Repurchased $ 71