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Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
CHF (SFr)
Dec. 31, 2020
GBP (£)
May 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Dec. 31, 2019
USD ($)
Carrying values of long-term borrowings              
Unamortized bond discounts, premiums and issuance costs, net $ (1,188)           $ (868)
Fair value adjustments 566           296
Other Long-term Debt 5           0
Total carrying value of debt 32,986           29,903
Less current portion (91)           (2,953)
Total long-term debt $ 32,895           26,950
0.41% 2023 Swiss franc Bonds [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 0.41% 0.41% 0.41% 0.41%      
Notes [Member]              
Debt Instrument [Line Items]              
Face amount         $ 4,000 $ 5,000  
Notes [Member] | 4.50% notes due 2020 (4.50% 2020 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.50% 4.50% 4.50% 4.50%      
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             300
Notes [Member] | 2.125% notes due 2020 (2.125% 2020 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.125% 2.125% 2.125% 2.125%      
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 $ 0           750
Notes [Member] | Floating Rate Notes Due 2020 [Member]              
Debt Instrument [Line Items]              
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           300
Notes [Member] | 2.20% notes due 2020 (2.20% 2020 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.20% 2.20% 2.20% 2.20%      
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 $ 0           700
Notes [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.45% 3.45% 3.45% 3.45%      
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             900
Notes [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.10% 4.10% 4.10% 4.10%      
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
Notes [Member] | 1.85% notes due 2021 (1.85% 2021 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 1.85% 1.85% 1.85% 1.85%      
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           750
Notes [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.875% 3.875% 3.875% 3.875%      
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
Notes [Member] | 1.25% notes due 2022 (1.25% 2022 euro Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 1.25% 1.25% 1.25% 1.25%      
Face amount | €   € 1,250,000,000          
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 $ 1,527           1,402
Notes [Member] | 2.70% notes due 2022 (2.70% 2022 Notes) [Member]              
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 $ 500           500
Notes [Member] | 2.65% notes due 2022 (2.65% 2022 Notes) [Member]              
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 $ 1,500           1,500
Notes [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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           750
Notes [Member] | 0.41% 2023 Swiss franc Bonds [Member]              
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 $ 791           725
Notes [Member] | 2.25% notes due 2023 (2.25% 2023 Notes) [Member]              
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) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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) [Member]              
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            
Notes [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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% 2026 euro Notes [Member]              
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 $ 916           841
Notes [Member] | 2.60% notes due 2026 (2.60% 2026 notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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% pound-sterling-denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]              
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 $ 649           630
Notes [Member] | 2.20% notes due 2027 (2.20% 2027 notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.20% 2.20% 2.20% 2.20% 2.20% 2.20%  
Face amount         $ 1,000 $ 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            
Notes [Member] | 3.20% notes due 2027 (3.20% 2027 Notes) [Member]              
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] | 4.00% pound-sterling-denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]              
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 $ 957           928
Notes [Member] | 2.45% notes due 2031 (2.45% 2031 Notes) [Member]              
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            
Notes [Member] | 2.30% notes due 2031 (2.30% 2031 Notes) [Member]              
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            
Notes [Member] | 6.375% notes due 2037 (6.375% 2037 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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           552
Notes [Member] | 6.90% notes due 2038 (6.90% 2038 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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           291
Notes [Member] | 6.40% notes due 2039 (6.40% 2039 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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           466
Notes [Member] | 3.15% notes due 2040 (3.15% 2040 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.15% 3.15% 3.15% 3.15% 3.15% 3.15%  
Face amount         $ 750 $ 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 $ 2,000            
Notes [Member] | 5.75% notes due 2040 (5.75% 2040 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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           412
Notes [Member] | 4.95% notes due 2041 (4.95% 2041 Notes) [Member]              
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) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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           974
Notes [Member] | 5.65% notes due 2042 (5.65% 2042 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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           487
Notes [Member] | 5.375% notes due 2043 (5.375% 2043 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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           261
Notes [Member] | 4.40% notes due 2045 (4.40% 2045 Notes) [Member]              
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) [Member]              
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] | Three Point Three Seven Five Percent Notes Due 2050 [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.375% 3.375% 3.375% 3.375% 3.375% 3.375%  
Face amount         $ 1,000 $ 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 $ 2,250            
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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] | 2.77% notes due 2053 (2.77% 2053 Notes) [Member]              
Debt Instrument [Line Items]              
Interest rate, stated percentage 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           0
Notes [Member] | Other notes due 2097 [Member]              
Carrying values of long-term borrowings              
Long-term debt, gross $ 100           $ 100
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