v3.26.1
Changes in Capital Structure - Schedule of Repurchases Under Share Repurchase Programs (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended 14 Months Ended 32 Months Ended
Jul. 31, 2026
Apr. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jul. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Jun. 30, 2026
Oct. 16, 2025
Oct. 31, 2023
Schedule of Capitalization, Equity [Line Items]                              
Amounts paid for shares repurchased     $ 444,000,000 [1] $ 484,000,000 [1] $ 282,000,000 [2] $ 322,000,000 [2]                  
Excludes or includes accrued excise tax     4,000,000 $ 3,000,000 $ 2,000,000 $ 2,000,000 $ 4,000,000     $ 9,000,000 $ 10,000,000 $ 9,000,000 $ 4,000,000    
Treasure shares acquired but not yet paid     $ 1,000,000       $ 1,000,000           $ 1,000,000    
Convertible Senior Notes Capped Calls                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)                 224,585            
Average price paid per share (in usd per share)                 $ 69.38            
Amounts paid for shares repurchased                 $ 16,000,000            
November 2023 Accelerated Share Repurchase Agreements                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)                       18,839,372      
Average price paid per share (in usd per share)                       $ 50.43      
LS Power entities share repurchases                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)             1,829,269                
Shares repurchased from LS Power                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)             1,058,189                
Average price paid per share (in usd per share)             $ 164.00                
Amounts paid for shares repurchased             $ 176,000,000                
Open market repurchases                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)   2,889,010                          
Average price paid per share (in usd per share)   $ 151.74                          
Amounts paid for shares repurchased   $ 438,000,000                          
Total Share Repurchases under the $3.0 billion authorization                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)             3,947,199                
Amounts paid for shares repurchased             $ 614,000,000                
Share repurchase program, authorized amount                           $ 3,000,000,000.0  
Total Share Repurchases under the $3.0 billion authorization | Subsequent Event                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares) 104,270             4,051,469              
Amounts paid for shares repurchased $ 14,000,000             $ 628,000,000              
Capital Allocation Plan, 2023                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)             1,917,980   10,196,205 11,725,563 22,730,940   46,570,688    
Average price paid per share (in usd per share)                         $ 79.43    
Amounts paid for shares repurchased             $ 307,000,000   $ 1,318,000,000 $ 925,000,000 $ 1,150,000,000   $ 3,700,000,000    
Share repurchase program, authorized amount                             $ 3,700,000,000
Capital Allocation Plan, Open Market Repurchases                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)             1,146,900   9,971,620 10,562,333 5,054,798        
Average price paid per share (in usd per share)             $ 156.62   $ 130.58 $ 87.57 $ 39.56        
Amounts paid for shares repurchased             $ 180,000,000   $ 1,302,000,000 $ 925,000,000 $ 200,000,000        
Excludes or includes accrued excise tax                 $ 11,000,000            
Estimated excise tax excluded             $ 7,000,000                
Capital Allocation Plan, Accelerated Repurchase Agreements                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)                   1,163,230 17,676,142        
Amounts paid for shares repurchased                   $ 0 $ 950,000,000        
Shares repurchased from LS Power                              
Schedule of Capitalization, Equity [Line Items]                              
Total number of shares purchased (in shares)             771,080                
Average price paid per share (in usd per share)             $ 164.00                
Amounts paid for shares repurchased             $ 127,000,000                
[1] Includes excise tax accrued of $4 million and $3 million for the quarters ended June 30 and March 31, 2026, respectively
[2] Includes excise tax accrued of $2 million for each of the quarter ended June 30 and March 31, 2025