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Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
CHF (SFr)
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
USD ($)
May 31, 2020
USD ($)
Mar. 31, 2020
Feb. 29, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                
Unamortized bond discounts, premiums and issuance costs, net       $ (849)       $ (868)
Fair value adjustments       678       296
Other       3       0
Total carrying value of debt       34,224       29,903
Less current portion       (91)       (2,953)
Total long-term debt       $ 34,133       26,950
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%     4.50%  
Long-term debt, gross               300
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) [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 2.125% 2.125% 2.125% 2.125%     2.125%  
Long-term debt, gross       $ 0       750
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 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross       $ 0       300
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) [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 2.20% 2.20% 2.20% 2.20%     2.20%  
Long-term debt, gross       $ 0       700
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) [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 3.45% 3.45% 3.45% 3.45%     3.45%  
Long-term debt, gross               900
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%     4.10%  
Long-term debt, gross               1,000
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) [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 1.85% 1.85% 1.85% 1.85%     1.85%  
Long-term debt, gross       $ 0       750
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) [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 3.875% 3.875% 3.875% 3.875%     3.875%  
Long-term debt, gross       $ 1,450       1,750
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
Notes [Member] | 1.25% €1,250 million 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%        
Long-term debt, gross       $ 1,404       1,402
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%              
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%        
Long-term debt, gross       $ 500       500
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 1,500       1,500
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%   3.625%    
Long-term debt, gross       $ 750       750
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
Notes [Member] | 0.41% CHF700 million bonds due 2023 (0.41% 2023 Swiss franc Bonds) [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 0.41% 0.41% 0.41% 0.41%        
Long-term debt, gross       $ 739       725
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%              
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%        
Long-term debt, gross       $ 750       750
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%   3.625%    
Long-term debt, gross       $ 1,400       1,400
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%  
Long-term debt, gross       $ 500        
Face amount             $ 500  
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%   3.125%    
Long-term debt, gross       $ 1,000       1,000
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
Notes [Member] | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 2.00% 2.00% 2.00% 2.00%        
Long-term debt, gross       $ 843       841
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%              
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%   2.60%    
Long-term debt, gross       $ 1,250       1,250
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
Notes [Member] | 5.50% £475 million 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%        
Long-term debt, gross       $ 589       630
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%              
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%  
Long-term debt, gross       $ 1,750        
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%              
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%        
Long-term debt, gross       $ 1,000       1,000
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
Notes [Member] | 4.00% £700 million 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%        
Long-term debt, gross       $ 868       928
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%              
Notes [Member] | 2.45% notes due 2030 (2.45% 2030 Notes) [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 2.45% 2.45% 2.45% 2.45%     2.45%  
Long-term debt, gross       $ 1,250        
Face amount             $ 1,250  
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%      
Long-term debt, gross       $ 1,250        
Face amount         $ 1,250      
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 552       552
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 291       291
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 466       466
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%  
Long-term debt, gross       $ 2,000        
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%              
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%        
Long-term debt, gross       $ 412       412
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 600       600
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 974       974
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 487       487
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 261       261
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 2,250       2,250
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
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%        
Long-term debt, gross       $ 1,415       1,415
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
Notes [Member] | 3.375% notes due 2050 (3.375% 2050 Notes) [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 3.375% 3.375% 3.375% 3.375% 3.375%   3.375%  
Long-term debt, gross       $ 2,250        
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%              
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%   4.663%    
Long-term debt, gross       $ 3,541       3,541
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%              
Notes [Member] | Other notes due 2097 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross       $ 100       $ 100