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Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
CHF (SFr)
Dec. 31, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Carrying values of long-term borrowings            
Unamortized bond discounts, premiums and issuance costs, net $ (868)       $ (896)  
Fair value adjustments 296       (53)  
Total carrying value of debt 29,903       33,929  
Less current portion (2,953)       (4,419)  
Total long-term debt $ 26,950       29,510  
0.41% 2023 Swiss franc Bonds [Member]            
Debt Instrument [Line Items]            
Interest rate, stated percentage 0.41% 0.41% 0.41% 0.41%    
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%    
Notes [Member]            
Debt Instrument [Line Items]            
Face amount           $ 4,500
Notes [Member] | 5.70% notes due 2019 (5.70% 2019 Notes) [Member]            
Debt Instrument [Line Items]            
Interest rate, stated percentage 5.70% 5.70% 5.70% 5.70%    
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         1,000  
Notes [Member] | 1.90% notes due 2019 (1.90% 2019 Notes) [Member]            
Debt Instrument [Line Items]            
Interest rate, stated percentage 1.90% 1.90% 1.90% 1.90%   1.90%
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 $ 0       700  
Notes [Member] | Floating Rate Notes Due 2019 [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         550  
Notes [Member] | 2.20% notes due 2019 (2.20% 2019 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         1,400  
Notes [Member] | 2.125% euro-denominated notes due 2019 (2.125% 2019 euro Notes) [Member]            
Debt Instrument [Line Items]            
Interest rate, stated percentage 2.125% 2.125% 2.125% 2.125%    
Face amount | €   € 675,000,000        
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         774  
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       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 $ 750       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 $ 300       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%   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 $ 700       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       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       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 $ 750       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       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 $ 1,402       1,433  
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%   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 $ 725       713  
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] | 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 $ 841       860  
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 $ 630       606  
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%   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 $ 928       893  
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 $ 552       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 $ 291       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 $ 466       466  
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 $ 412       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 $ 974       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 $ 487       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 $ 261       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] | 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] | 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