v3.21.1
Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator for loss per share, basic and diluted    
Net loss attributable to controlling interest $ (99) $ (392)
Denominator for loss per share, basic and diluted    
Weighted-average shares outstanding (in shares) 616,000 613,000
Effect of share-based awards (in shares) 1,000 1,000
Weighted-average shares for per share calculation 617,000 614,000
Loss per share, basic and diluted (in dollars per share) $ (0.16) $ (0.64)
Share-based awards    
Denominator for loss per share, basic and diluted    
Securities excluded from earnings per share calculation (in shares) 13,800 11,100
Convertible debt    
Denominator for loss per share, basic and diluted    
Securities excluded from earnings per share calculation (in shares) 92,900 84,000
0.50% Exchangeable Senior Bonds due January 2023    
Denominator for loss per share, basic and diluted    
Debt instrument interest rate stated percentage 0.50%  
2.50% Senior Guaranteed Exchangeable Bonds due January 2027    
Denominator for loss per share, basic and diluted    
Debt instrument interest rate stated percentage 2.50%  
4.00% Senior Guaranteed Exchangeable Bonds due December 2025    
Denominator for loss per share, basic and diluted    
Debt instrument interest rate stated percentage 4.00%