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Debt - Summary of Debt (Detail) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
May 31, 2023
Mar. 31, 2022
Mar. 31, 2020
Oct. 31, 2018
Mar. 31, 2018
Apr. 30, 2017
Aug. 31, 2016
Jan. 31, 2015
Apr. 30, 2014
Nov. 30, 2002
Mar. 31, 1999
Debt Instrument [Line Items]                            
Debt [1] $ 6,896,000,000 $ 6,893,000,000 $ 6,892,000,000                      
Fair value 6,398,000,000 6,173,000,000 6,498,000,000                      
Senior Notes 2.45% Due 2027                            
Debt Instrument [Line Items]                            
Debt, face amount                   $ 500,000,000        
Debt, stated interest rate                   2.45%        
Long-term debt 499,000,000 499,000,000 499,000,000                      
Fair value 491,000,000 479,000,000 483,000,000                      
Senior Notes 2.50% Due 2027                            
Debt Instrument [Line Items]                            
Debt, face amount         $ 500,000,000                  
Debt, stated interest rate         2.50%                  
Long-term debt 499,000,000 499,000,000 498,000,000                      
Fair value 490,000,000 479,000,000 482,000,000                      
Senior Notes 6.625% Due 2029                            
Debt Instrument [Line Items]                            
Debt, face amount                           $ 300,000,000
Debt, stated interest rate                           6.625%
Long-term debt 298,000,000 298,000,000 298,000,000                      
Fair value 323,000,000 320,000,000 330,000,000                      
Senior Notes 4.00% Due 2029                            
Debt Instrument [Line Items]                            
Debt, face amount             $ 550,000,000              
Debt, stated interest rate             4.00%              
Long-term debt 548,000,000 547,000,000 547,000,000                      
Fair value 550,000,000 534,000,000 549,000,000                      
Senior Notes 3.20% Due 2030                            
Debt Instrument [Line Items]                            
Debt, face amount           $ 500,000,000                
Debt, stated interest rate           3.20%                
Long-term debt 498,000,000 498,000,000 498,000,000                      
Fair value 481,000,000 462,000,000 476,000,000                      
Senior Notes 3.00% Due 2032                            
Debt Instrument [Line Items]                            
Debt, face amount         $ 500,000,000                  
Debt, stated interest rate         3.00%                  
Long-term debt 497,000,000 497,000,000 497,000,000                      
Fair value 461,000,000 439,000,000 458,000,000                      
Senior Notes 6.25% Due 2032                            
Debt Instrument [Line Items]                            
Debt, face amount                         $ 400,000,000  
Debt, stated interest rate                         6.25%  
Long-term debt 397,000,000 397,000,000 397,000,000                      
Fair value 445,000,000 430,000,000 450,000,000                      
Senior Notes 4.95% Due 2033                            
Debt Instrument [Line Items]                            
Debt, face amount       $ 500,000,000                    
Debt, stated interest rate       4.95%                    
Long-term debt 497,000,000 497,000,000 497,000,000                      
Fair value 514,000,000 495,000,000 519,000,000                      
Senior Notes 4.35% Due 2044                            
Debt Instrument [Line Items]                            
Debt, face amount                       $ 350,000,000    
Debt, stated interest rate                       4.35%    
Long-term debt 347,000,000 347,000,000 347,000,000                      
Fair value 308,000,000 298,000,000 319,000,000                      
Senior Notes 3.70% Due 2045                            
Debt Instrument [Line Items]                            
Debt, face amount                     $ 400,000,000      
Debt, stated interest rate                     3.70%      
Long-term debt 396,000,000 396,000,000 396,000,000                      
Fair value 320,000,000 308,000,000 331,000,000                      
Senior Notes 4.125% Due 2047                            
Debt Instrument [Line Items]                            
Debt, face amount                 $ 850,000,000          
Debt, stated interest rate                 4.125%          
Long-term debt 843,000,000 842,000,000 842,000,000                      
Fair value 716,000,000 684,000,000 750,000,000                      
Senior Notes 4.20% Due 2048                            
Debt Instrument [Line Items]                            
Debt, face amount               $ 600,000,000            
Debt, stated interest rate               4.20%            
Long-term debt 591,000,000 591,000,000 591,000,000                      
Fair value 510,000,000 490,000,000 532,000,000                      
Senior Notes 3.95% Due 2050                            
Debt Instrument [Line Items]                            
Debt, face amount           $ 500,000,000                
Debt, stated interest rate           3.95%                
Long-term debt 492,000,000 491,000,000 491,000,000                      
Fair value 404,000,000 386,000,000 420,000,000                      
Senior Notes 3.70% Due 2052                            
Debt Instrument [Line Items]                            
Debt, face amount         $ 500,000,000                  
Debt, stated interest rate         3.70%                  
Long-term debt 494,000,000 494,000,000 494,000,000                      
Fair value $ 385,000,000 $ 369,000,000 $ 399,000,000                      
[1] Consists solely of long-term debt. See Note 4 – Debt for further discussion.