Quarterly report pursuant to Section 13 or 15(d)

Debt - Summary of Debt (Details)

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Debt - Summary of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Outstanding principal $ 4,020  
Deferred financing costs (3) $ (4)
Total 4,014 3,761
Debt classified as current (25) (28)
Total long-term debt 3,989 3,733
2.75% Exchangeable Senior Debentures due 2050    
Debt Instrument [Line Items]    
Outstanding principal 575  
Carrying value $ 569 $ 585
Interest rate (as a percent) 2.75% 2.75%
1.25% Exchangeable Senior Debentures due 2050    
Debt Instrument [Line Items]    
Outstanding principal $ 825  
Carrying value $ 790 $ 818
Interest rate (as a percent) 1.25% 1.25%
1.75% Exchangeable Senior Debentures due 2046    
Debt Instrument [Line Items]    
Outstanding principal $ 15  
Carrying value $ 22 $ 25
Interest rate (as a percent) 1.75% 1.75%
Senior notes    
Debt Instrument [Line Items]    
Outstanding principal $ 600  
Carrying value 631 $ 632
Line of credit    
Debt Instrument [Line Items]    
Outstanding principal 399  
Carrying value 399 399
Wells Fargo note payable    
Debt Instrument [Line Items]    
Outstanding principal 6  
Carrying value 6 6
SPV | Margin Loan Facility    
Debt Instrument [Line Items]    
Outstanding principal 1,600  
Carrying value $ 1,600 $ 1,300