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Debt and Other Credit Facilities (Narrative) (Details)
12 Months Ended
Nov. 10, 2021
$ / shares
Nov. 15, 2018
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Mar. 31, 2024
Mar. 31, 2022
Nov. 18, 2021
USD ($)
Nov. 18, 2021
GBP (£)
Jun. 30, 2020
Nov. 15, 2018
GBP (£)
Debt Instrument [Line Items]                      
Revolving credit agreement     $ 1,868,000,000 $ 1,596,000,000              
Line of credit facility, maximum borrowing capacity               $ 1,954,000,000      
Cash dividends declared per share (usd per share) | $ / shares     $ 0.44 $ 0.40 $ 0.32            
Nonrecourse project debt     $ 2,000,000 $ 2,000,000             £ 62,000,000
Proceeds from sale of warrants   $ 22,000,000                  
Exercise price (usd per share) | $ / shares   $ 40.02 $ 39.76 $ 39.88 40.02            
Percentage of strike price above reported last sale price     3976.00%                
Term Loan A | Scenario, Forecast                      
Debt Instrument [Line Items]                      
Percentage of aggregate principal           1.25% 0.625%        
Term Loan A | Secured Debt                      
Debt Instrument [Line Items]                      
Revolving credit agreement               442,000,000      
Covenant, interest coverage ratio     3.00                
Term Loan A | Secured Debt | Subsidiaries                      
Debt Instrument [Line Items]                      
Revolving credit agreement | £                 £ 122,100,000    
Term Loan A | Secured Debt | Maximum                      
Debt Instrument [Line Items]                      
Debt instrument, covenant, leverage ratio through 2022     4.50                
Debt instrument, covenant, leverage ratio through 2023     4.25                
Debt instrument, covenant, leverage ratio through 2024     4.00                
Term Loan B | Reference Rate (a)                      
Debt Instrument [Line Items]                      
Basis spread on variable rate     2.75%                
Term Loan B | Secured Debt                      
Debt Instrument [Line Items]                      
Revolving credit agreement               512,000,000      
Percentage of aggregate principal                   0.25%  
Notes Due 2023 | Convertible Notes                      
Debt Instrument [Line Items]                      
Aggregate principal amount   $ 350,000,000                  
Interest rate, stated percentage   2.50%                 2.50%
Conversion price (usd per share) | $ / shares   $ 25.51 $ 25.35 $ 0 $ 25.51            
Conversion rate 0.0394261 0.0391961                  
Cash dividends declared per share (usd per share) | $ / shares $ 0.11                    
Strike price (usd per share) | $ / shares $ 25.35                    
If-converted value in excess of principal     $ 308,000,000                
Net convertible carrying amount of equity component     57,000,000 $ 57,000,000              
Interest cost, contractual coupon     9,000,000 9,000,000 $ 9,000,000            
Interest cost, amortization of discount     $ 14,000,000 $ 13,000,000 $ 12,000,000            
Guaranteed secured bonds, percentage     6.50% 6.50%              
Revolving Credit Facility | Senior Credit Facility                      
Debt Instrument [Line Items]                      
Letters of credit, outstanding amount     $ 48,000,000         $ 1,000,000,000      
Long-term line of credit     $ 364,000,000