v3.26.3
Debt - Summary of Debt (Detail) - USD ($)
Sep. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Sep. 30, 2025
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]                              
Long-term debt, current maturities     $ 0 $ 0                      
Debt [1] $ 8,389,000,000   6,897,000,000 6,896,000,000                      
Fair value 7,345,000,000   6,345,000,000 6,398,000,000                      
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, current maturities 500,000,000                            
Long-term debt     499,000,000 499,000,000                      
Fair value 497,000,000   493,000,000 491,000,000                      
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, current maturities 500,000,000                            
Long-term debt     499,000,000 499,000,000                      
Fair value 495,000,000   492,000,000 490,000,000                      
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 299,000,000   299,000,000 298,000,000                      
Fair value 308,000,000   323,000,000 323,000,000                      
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 549,000,000   548,000,000 548,000,000                      
Fair value 533,000,000   551,000,000 550,000,000                      
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 463,000,000   484,000,000 481,000,000                      
Senior Notes 4.60% Due 2031                              
Debt Instrument [Line Items]                              
Debt, face amount   $ 500,000,000                          
Debt, stated interest rate   4.60%                          
Long-term debt 497,000,000   0 0                      
Fair value 479,000,000   0 0                      
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 437,000,000   462,000,000 461,000,000                      
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 398,000,000   397,000,000 397,000,000                      
Fair value 412,000,000   442,000,000 445,000,000                      
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 476,000,000   513,000,000 514,000,000                      
Senior Notes 5.15% Due 2036                              
Debt Instrument [Line Items]                              
Debt, face amount   $ 1,000,000,000                          
Debt, stated interest rate   5.15%                          
Long-term debt 991,000,000   0 0                      
Fair value 935,000,000   0 0                      
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 274,000,000   304,000,000 308,000,000                      
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 284,000,000   314,000,000 320,000,000                      
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   843,000,000 843,000,000                      
Fair value 627,000,000   702,000,000 716,000,000                      
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 446,000,000   498,000,000 510,000,000                      
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   492,000,000 492,000,000                      
Fair value 351,000,000   392,000,000 404,000,000                      
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 $ 328,000,000   $ 375,000,000 $ 385,000,000                      
[1] Consists of both short-term and long-term debt. See Note 4 – Debt for further discussion.