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Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CHF (SFr)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
USD ($)
Carrying values of long-term borrowings          
Unamortized bond discounts, premiums and issuance costs, net $ (1,213)       $ (1,188)
Fair value adjustments 284       566
Other Long-term Debt 15       5
Total carrying value of debt 33,309       32,986
Less current portion (87)       (91)
Total long-term debt $ 33,222       32,895
0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 0.41% 0.41% 0.41% 0.41%  
Notes [Member]          
Debt Instrument [Line Items]          
Face amount $ 5,000       $ 9,000
Notes [Member] | 1.25% 2022 euro Notes [Member]          
Debt Instrument [Line Items]          
Interest rate, stated percentage 1.25% 1.25% 1.25% 1.25% 1.25%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross         $ 1,527
Notes [Member] | 2.70% notes due 2022 (2.70% 2022 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.70% 2.70% 2.70% 2.70%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 0       500
Notes [Member] | 2.65% notes due 2022 (2.65% 2022 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.65% 2.65% 2.65% 2.65%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 0       $ 1,500
Notes [Member] | 3.625% notes due 2022 (3.625% 2022 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 3.625% 3.625% 3.625% 3.625% 3.625%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross         $ 750
Notes [Member] | 0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 0.41% 0.41% 0.41% 0.41%  
Face amount | SFr   SFr 700,000,000      
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 767       791
Notes [Member] | 2.25% notes due 2023 (2.25% 2023 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.25% 2.25% 2.25% 2.25%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 750       $ 750
Notes [Member] | 3.625% notes due 2024 (3.625% 2024 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 3.625% 3.625% 3.625% 3.625% 3.625%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,400       $ 1,400
Notes [Member] | 1.90% notes due 2025 (1.90% 2025 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 1.90% 1.90% 1.90% 1.90% 1.90%
Face amount         $ 500
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 500       $ 500
Notes [Member] | 3.125% notes due 2025 (3.125% 2025 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 3.125% 3.125% 3.125% 3.125% 3.125%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,000       $ 1,000
Notes [Member] | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.00% 2.00% 2.00% 2.00%  
Face amount | €     € 750,000,000    
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 853       $ 916
Notes [Member] | 2.60% notes due 2026 (2.60% 2026 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.60% 2.60% 2.60% 2.60% 2.60%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,250       $ 1,250
Notes [Member] | 5.50% £475 million notes due 2026 (5.50% 2026 pound sterling Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 5.50% 5.50% 5.50% 5.50%  
Face amount | £       £ 475,000,000  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 643       $ 649
Notes [Member] | 2.20% notes due 2027 (2.20% 2027 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.20% 2.20% 2.20% 2.20% 2.20%
Face amount         $ 1,750
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,750       1,750
Notes [Member] | 3.20% notes due 2027 (3.20% 2027 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 3.20% 3.20% 3.20% 3.20%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,000       1,000
Notes [Member] | 1.65% notes due in 2028 (1.65% 2028 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 1.65% 1.65% 1.65% 1.65%  
Face amount $ 1,250        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,250        
Notes [Member] | 4.00% £700 million notes due 2029 (4.00% 2029 pound sterling Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 4.00% 4.00% 4.00% 4.00%  
Face amount | £       £ 700,000,000  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 947       $ 957
Notes [Member] | 2.45% notes due 2030 (2.45% 2030 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.45% 2.45% 2.45% 2.45% 2.45%
Face amount         $ 1,250
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,250       $ 1,250
Notes [Member] | 2.30% notes due 2031 (2.30% 2031 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.30% 2.30% 2.30% 2.30% 2.30%
Face amount         $ 1,250
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,250       $ 1,250
Notes [Member] | 2.00% notes due 2032 (2.00% 2032 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.00% 2.00% 2.00% 2.00%  
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,250        
Notes [Member] | 6.375% notes due 2037 (6.375% 2037 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 6.375% 6.375% 6.375% 6.375% 6.375%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 478       $ 478
Notes [Member] | 6.90% notes due 2038 (6.90% 2038 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 6.90% 6.90% 6.90% 6.90% 6.90%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 254       $ 254
Notes [Member] | 6.40% notes due 2039 (6.40% 2039 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 6.40% 6.40% 6.40% 6.40% 6.40%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 333       $ 333
Notes [Member] | 3.15% notes due 2040 (3.15% 2040 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 3.15% 3.15% 3.15% 3.15% 3.15%
Face amount         $ 2,000
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 2,000       $ 2,000
Notes [Member] | 5.75% notes due 2040 (5.75% 2040 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 5.75% 5.75% 5.75% 5.75% 5.75%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 373       $ 373
Notes [Member] | 2.80% notes due 2041 (2.80% 2041 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.80% 2.80% 2.80% 2.80%  
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,150        
Notes [Member] | 4.95% notes due 2041 (4.95% 2041 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 4.95% 4.95% 4.95% 4.95%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 600       $ 600
Notes [Member] | 5.15% notes due 2041 (5.15% 2041 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 5.15% 5.15% 5.15% 5.15% 5.15%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 729       $ 729
Notes [Member] | 5.65% notes due 2042 (5.65% 2042 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 5.65% 5.65% 5.65% 5.65% 5.65%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 415       $ 415
Notes [Member] | 5.375% notes due 2043 (5.375% 2043 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 5.375% 5.375% 5.375% 5.375% 5.375%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 185       $ 185
Notes [Member] | 4.40% notes due 2045 (4.40% 2045 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 4.40% 4.40% 4.40% 4.40%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 2,250       2,250
Notes [Member] | 4.563% notes due 2048 (4.563% 2048 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 4.563% 4.563% 4.563% 4.563%  
Effective interest rate on note 6.30% 6.30% 6.30% 6.30%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,415       $ 1,415
Notes [Member] | 3.375% notes due 2050 (3.375% 2050 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 3.375% 3.375% 3.375% 3.375% 3.375%
Face amount         $ 2,250
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 2,250       $ 2,250
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 4.663% 4.663% 4.663% 4.663% 4.663%
Effective interest rate on note 5.60% 5.60% 5.60% 5.60%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 3,541       $ 3,541
Notes [Member] | 3.00% notes due 2052 (3.00% 2052 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 3.00% 3.00% 3.00% 3.00%  
Face amount $ 1,350        
Carrying values of long-term borrowings          
Long-term debt, gross $ 1,350        
Notes [Member] | 2.77% notes due 2053 (2.77% 2053 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.77% 2.77% 2.77% 2.77% 2.77%
Face amount         $ 940
Effective interest rate on note 5.20% 5.20% 5.20% 5.20%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Carrying values of long-term borrowings          
Long-term debt, gross $ 940       940
Notes [Member] | Other notes due 2097          
Carrying values of long-term borrowings          
Long-term debt, gross $ 100       $ 100
Notes [Member] | 4.10% notes due 2021 (4.10% 2021 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage         4.10%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Notes [Member] | 2.125% notes due 2020 (2.125% 2020 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage         2.125%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Notes [Member] | 3.45% notes due 2020 (3.45% 2020 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage         3.45%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Notes [Member] | 1.85% notes due 2021 (1.85% 2021 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage         1.85%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Notes [Member] | 4.50% notes due 2020 (4.50% 2020 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage         4.50%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Notes [Member] | Floating Rate Notes Due 2020          
Debt Instrument [Line Items]          
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Notes [Member] | 2.20% notes due 2020 (2.20% 2020 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage         2.20%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Notes [Member] | 3.875% notes due 2021 (3.875% 2021 Notes)          
Debt Instrument [Line Items]          
Interest rate, stated percentage         3.875%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%        
Debt securities payable [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Redemption period without payment of make whole amount 1 month        
Debt securities payable [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Redemption period without payment of make whole amount 6 months