Annual report pursuant to Section 13 and 15(d)

Long term Debt -Schedule of Summarized Terms of Senior Unsecured Notes (Details)

v3.20.4
Long term Debt -Schedule of Summarized Terms of Senior Unsecured Notes (Details) - Senior Unsecured Notes - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Principal $ 1,275 $ 500
2024 Notes    
Debt Instrument [Line Items]    
Principal $ 500  
Stated Interest Rate 5.25%  
Proceeds from issuance of debt $ 157  
Proceeds from Debt, Net of Issuance Costs $ 155  
Debt instrument, yield to maturity 4.13%  
Redemption price, percentage 40.00%  
2024 Notes, first issuance    
Debt Instrument [Line Items]    
Principal $ 350  
2024 Notes, second issuance    
Debt Instrument [Line Items]    
Principal 150  
2025 Notes    
Debt Instrument [Line Items]    
Principal $ 400  
Stated Interest Rate 6.00%  
Redemption price, percentage 40.00%  
2030 Notes    
Debt Instrument [Line Items]    
Principal $ 375  
Stated Interest Rate 3.75%  
Proceeds from issuance of debt $ 371  
Proceeds from Debt, Net of Issuance Costs $ 367  
Debt instrument, yield to maturity 3.87%  
Redemption price, percentage 40.00%  
Offer share percentage 103.75%