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Debt - Unsecured Senior Notes and Interest Expense and Financing Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 04, 2020
Aug. 05, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Amount outstanding     $ 3,650 $ 2,700  
Proceeds from debt issuances, net of discounts     1,994 0 $ 0
Debt discount and financing costs     45 25  
Loss on extinguishment of debt     $ 31 $ 0 $ 40
Unsecured Notes | Unsecured 2030 and 2050 Notes          
Debt Instrument [Line Items]          
Proceeds from debt issuances, net of discounts   $ 2,000      
Debt discount and financing costs   $ 26      
Unsecured Notes | Unsecured 2021 and 2022 Notes          
Debt Instrument [Line Items]          
Redemption price percentage 100.00%        
Make-whole premium $ 28        
Loss on extinguishment of debt $ 31        
Unsecured Notes | The Notes          
Debt Instrument [Line Items]          
Redemption price percentage     101.00%    
Unsecured Notes | The Notes | Debt Instrument, Redemption, Period One          
Debt Instrument [Line Items]          
Redemption price percentage     100.00%