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Financing Arrangements and Derivative Financial Instruments - Notes Narrative (Details) - USD ($)
6 Months Ended
May 18, 2021
May 06, 2021
Apr. 06, 2021
Jun. 30, 2021
Jun. 30, 2020
May 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]              
Notes payable       $ 5,436,000,000     $ 3,860,000,000
Senior notes             $ 1,450,000,000
Repayments of long-term debt       $ 3,042,000,000 $ 3,879,000,000    
5.125% due 2023 | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount           $ 1,000,000,000.0  
Interest rate, stated percentage   5.125%   5.125%   5.125% 5.125%
Debt instrument, redemption price percentage   100.00%          
Repayments of long-term debt   $ 1,000,000,000.0          
5.25% due April 2031 | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount     $ 550,000,000        
Interest rate, stated percentage     5.25% 5.25%     5.25%
Debt instrument, maturity date     Apr. 30, 2031        
Notes sold, percentage of principle amount     100.00%        
Basis spread     0.50%        
5.25% due April 2031 | Senior Notes | Debt Instrument, Redemption, Prior to January 2031              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage     100.00%        
5.25% due April 2031 | Senior Notes | Debt Instrument, Redemption, After to January 2031              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage     100.00%        
5.25% due July 2031 | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount $ 600,000,000            
Interest rate, stated percentage 5.25%     5.25%     5.25%
Debt instrument, maturity date Jul. 15, 2031            
Notes sold, percentage of principle amount 100.00%            
Basis spread 0.50%            
5.25% due July 2031 | Senior Notes | Debt Instrument, Redemption, Prior to April 2031              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage 100.00%            
5.25% due July 2031 | Senior Notes | Debt Instrument, Redemption, After to April 2031              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage 100.00%            
5.625% due 2033 | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount     $ 450,000,000        
Interest rate, stated percentage     5.625% 5.625%     5.625%
Debt instrument, maturity date     Apr. 30, 2033        
Notes sold, percentage of principle amount     100.00%        
Basis spread     0.50%        
5.625% due 2033 | Senior Notes | Debt Instrument, Redemption, Prior to January 2033              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage     100.00%        
5.625% due 2033 | Senior Notes | Debt Instrument, Redemption, After to January 2033              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage     100.00%        
5% due 2029 | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount $ 850,000,000            
Interest rate, stated percentage 5.00%     5.00%     5.00%
Debt instrument, maturity date Jul. 15, 2029            
Notes sold, percentage of principle amount 100.00%            
Basis spread 0.50%            
5% due 2029 | Senior Notes | Debt Instrument, Redemption, Prior to April 2029              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage 100.00%            
5% due 2029 | Senior Notes | Debt Instrument, Redemption, After to April 2029              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage 100.00%            
7.625% due 2027 | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount       $ 117,000,000      
Interest rate, stated percentage       7.625%      
Debt instrument, maturity date       Mar. 15, 2027      
Debt extinguishment costs related to remaining unamortized debt issuance costs       $ 19,000,000