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Financing arrangements - Principal Amounts and Carrying Value of Long-term Borrowings (Details)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
GBP (£)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CHF (SFr)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]              
Unamortized bond discounts, premiums and issuance costs, net $ (1,420,000,000)       $ (1,246,000,000)    
Fair value adjustments (314,000,000)       (437,000,000)    
Other 17,000,000       12,000,000    
Total carrying value of debt 64,613,000,000       38,945,000,000    
Less current portion (1,443,000,000)       (1,591,000,000)    
Total long-term debt $ 63,170,000,000       37,354,000,000    
Notes              
Debt Instrument [Line Items]              
Face amount       $ 24,000,000,000 $ 7,000,000,000   $ 5,000,000,000
0.41% CHF700 million bonds due 2023 (0.41% 2023 Swiss franc Bonds) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 0.41% 0.41% 0.41% 0.41% 0.41% 0.41%  
Face amount | SFr           SFr 700,000,000  
Long-term debt, gross         $ 757,000,000    
2.25% notes due 2023 (2.25% 2023 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage         2.25% 2.25%  
Face amount $ 750,000,000            
Long-term debt, gross         $ 750,000,000    
3.625% notes due 2024 (3.625% 2024 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.625% 3.625% 3.625%        
Long-term debt, gross $ 1,400,000,000       1,400,000,000    
1.90% notes due 2025 (1.90% 2025 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 1.90% 1.90% 1.90%        
Long-term debt, gross $ 500,000,000       500,000,000    
5.25% 2025 Notes | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.25% 5.25% 5.25%        
Face amount       $ 2,000,000,000      
5.25% notes due 2025 (5.25% 2025 Notes) | Notes              
Debt Instrument [Line Items]              
Long-term debt, gross $ 2,000,000,000            
Term loan due April 2025 | Secured Debt              
Debt Instrument [Line Items]              
Long-term debt, gross $ 2,000,000,000            
3.125% notes due 2025 (3.125% 2025 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.125% 3.125% 3.125%        
Long-term debt, gross $ 1,000,000,000       1,000,000,000    
2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.00% 2.00% 2.00%        
Face amount | €   € 750,000,000          
Long-term debt, gross $ 828,000,000       803,000,000    
5.507% notes due 2026 (5.507% 2026 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.507% 5.507% 5.507%        
Face amount       1,500,000,000      
Long-term debt, gross $ 1,500,000,000            
2.60% notes due 2026 (2.60% 2026 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.60% 2.60% 2.60%        
Long-term debt, gross $ 1,250,000,000       1,250,000,000    
Term loan due October 2026 | Secured Debt              
Debt Instrument [Line Items]              
Long-term debt, gross $ 2,000,000,000            
5.50% £475 million notes due 2026 (5.50% 2026 pound sterling Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.50% 5.50% 5.50%        
Face amount | £     £ 475,000,000        
Long-term debt, gross $ 605,000,000       $ 574,000,000    
2.20% notes due 2027 (2.20% 2027 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.20% 2.20% 2.20%   2.20% 2.20%  
Long-term debt, gross $ 1,724,000,000       $ 1,724,000,000    
3.20% notes due 2027 (3.20% 2027 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.20% 3.20% 3.20%        
Long-term debt, gross $ 1,000,000,000       $ 1,000,000,000    
5.15% notes due 2028 (5.15% 2028 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.15% 5.15% 5.15%        
Face amount       3,750,000,000      
Long-term debt, gross $ 3,750,000,000            
1.65% notes due in 2028 (1.65% 2028 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 1.65% 1.65% 1.65%   1.65% 1.65% 1.65%
Face amount             $ 1,250,000,000
Long-term debt, gross $ 1,234,000,000       $ 1,234,000,000    
3.00% notes due 2029 (3.00% 2029 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.00% 3.00% 3.00%   3.00% 3.00%  
Face amount         $ 750,000,000    
Long-term debt, gross $ 750,000,000       $ 750,000,000    
4.05% notes due 2029 (4.05% 2029 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.05% 4.05% 4.05%   4.05% 4.05%  
Face amount         $ 1,250,000,000    
Long-term debt, gross $ 1,250,000,000       1,250,000,000    
4.00% £700 million notes due 2029 (4.00% 2029 pound sterling Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.00% 4.00% 4.00%        
Face amount | £     £ 700,000,000        
Long-term debt, gross $ 892,000,000       846,000,000    
2.45% notes due 2030 (2.45% 2030 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.45% 2.45% 2.45%       2.45%
Long-term debt, gross $ 1,250,000,000       1,250,000,000    
5.25% notes due 2030 (5.25% 2030 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.25% 5.25% 5.25%        
Face amount       2,750,000,000      
Long-term debt, gross $ 2,750,000,000            
2.30% notes due 2031 (2.30% 2031 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.30% 2.30% 2.30%       2.30%
Long-term debt, gross $ 1,250,000,000       $ 1,250,000,000    
2.00% notes due 2032 (2.00% 2032 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.00% 2.00% 2.00%   2.00% 2.00%  
Long-term debt, gross $ 1,001,000,000       $ 1,051,000,000    
3.35% notes due 2032 (3.35% 2032 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.35% 3.35% 3.35%   3.35% 3.35%  
Face amount         $ 1,000,000,000    
Long-term debt, gross $ 1,000,000,000       $ 1,000,000,000    
4.20% notes due 2033 (4.20% 2033 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.20% 4.20% 4.20%   4.20% 4.20%  
Face amount         $ 750,000,000    
Long-term debt, gross $ 750,000,000       750,000,000    
5.25% notes due 2033 (5.25% 2033 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.25% 5.25% 5.25%        
Face amount       4,250,000,000      
Long-term debt, gross $ 4,250,000,000            
6.375% notes due 2037 (6.375% 2037 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 6.375% 6.375% 6.375%        
Long-term debt, gross $ 478,000,000       478,000,000    
6.90% notes due 2038 (6.90% 2038 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 6.90% 6.90% 6.90%        
Long-term debt, gross $ 254,000,000       254,000,000    
6.40% notes due 2039 (6.40% 2039 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 6.40% 6.40% 6.40%        
Long-term debt, gross $ 333,000,000       333,000,000    
3.15% notes due 2040 (3.15% 2040 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.15% 3.15% 3.15%        
Long-term debt, gross $ 1,803,000,000       2,000,000,000    
5.75% notes due 2040 (5.75% 2040 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.75% 5.75% 5.75%        
Long-term debt, gross $ 373,000,000       $ 373,000,000    
2.80% notes due 2041 (2.80% 2041 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.80% 2.80% 2.80%   2.80% 2.80%  
Long-term debt, gross $ 949,000,000       $ 1,110,000,000    
Four Point Nine Five Percent Notes Due 2041 [Member] | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.95% 4.95% 4.95%        
Long-term debt, gross $ 600,000,000       600,000,000    
5.15% notes due 2041 (5.15% 2041 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.15% 5.15% 5.15%        
Long-term debt, gross $ 729,000,000       729,000,000    
5.65% notes due 2042 (5.65% 2042 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.65% 5.65% 5.65%        
Long-term debt, gross $ 415,000,000       415,000,000    
5.60% notes due 2043 (5.60% 2043 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.60% 5.60% 5.60%        
Face amount       2,750,000,000      
Long-term debt, gross $ 2,750,000,000       0    
5.375% notes due 2043 (5.375% 2043 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.375% 5.375% 5.375%        
Long-term debt, gross $ 185,000,000       185,000,000    
4.40% notes due 2045 (4.40% 2045 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.40% 4.40% 4.40%        
Long-term debt, gross $ 2,250,000,000       2,250,000,000    
4.563% notes due 2048 (4.563% 2048 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.563% 4.563% 4.563%        
Long-term debt, gross $ 1,415,000,000       1,415,000,000    
3.375% notes due 2050 (3.375% 2050 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.375% 3.375% 3.375%        
Long-term debt, gross $ 2,132,000,000       2,250,000,000    
4.663% notes due 2051 (4.663% 2051 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.663% 4.663% 4.663%        
Long-term debt, gross $ 3,541,000,000       $ 3,541,000,000    
3.00% notes due 2052 (3.00% 2052 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.00% 3.00% 3.00%   3.00% 3.00% 3.00%
Face amount             $ 1,350,000,000
Long-term debt, gross $ 999,000,000       $ 1,254,000,000    
4.20% notes due 2052 (4.20% 2052 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.20% 4.20% 4.20%   4.20% 4.20%  
Face amount         $ 1,000,000,000    
Long-term debt, gross $ 950,000,000       $ 1,000,000,000    
4.875% notes due 2053 (4.875% 2053 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.875% 4.875% 4.875%   4.875% 4.875%  
Face amount         $ 1,000,000,000    
Long-term debt, gross $ 1,000,000,000       1,000,000,000    
5.65% notes due 2053 (5.65% 2053 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.65% 5.65% 5.65%        
Face amount       4,250,000,000      
Long-term debt, gross $ 4,250,000,000       0    
2.77% notes due 2053 (2.77% 2053 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.77% 2.77% 2.77%        
Long-term debt, gross $ 940,000,000       $ 940,000,000    
4.40% notes due 2062 (4.40% 2062 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.40% 4.40% 4.40%   4.40% 4.40%  
Face amount         $ 1,250,000,000    
Long-term debt, gross $ 1,200,000,000       1,250,000,000    
5.75% notes due 2063 (5.75% 2063 Notes) | Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 5.75% 5.75% 5.75%        
Face amount       $ 2,750,000,000      
Long-term debt, gross $ 2,750,000,000       0    
Other notes due 2097 | Notes              
Debt Instrument [Line Items]              
Long-term debt, gross $ 100,000,000       $ 100,000,000