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Financing arrangements (Schedule Interest Rate Swaps) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
4.663% notes due 2051 (4.663% 2051 Notes) [Member]    
Debt Instrument [Line Items]    
Rate difference in an interest rate swap relationship 1.50%  
Notes Payable, Other Payables [Member]    
Debt Instrument [Line Items]    
Notional amounts $ 7,350 $ 9,550
Notes Payable, Other Payables [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member]    
Debt Instrument [Line Items]    
Notional amounts $ 0 $ 900
Interest rate, stated percentage 3.45%  
Notes Payable, Other Payables [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 1.10% 1.10%
Notes Payable, Other Payables [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member]    
Debt Instrument [Line Items]    
Notional amounts $ 0 $ 1,000
Interest rate, stated percentage 4.10%  
Notes Payable, Other Payables [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 1.70% 1.70%
Notes Payable, Other Payables [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member]    
Debt Instrument [Line Items]    
Notional amounts $ 1,450 $ 1,750
Interest rate, stated percentage 3.875%  
Notes Payable, Other Payables [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 2.00% 2.00%
Notes Payable, Other Payables [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member]    
Debt Instrument [Line Items]    
Notional amounts $ 750 $ 750
Interest rate, stated percentage 3.625%  
Notes Payable, Other Payables [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 2.70% 1.60%
Notes Payable, Other Payables [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member]    
Debt Instrument [Line Items]    
Notional amounts $ 1,400 $ 1,400
Interest rate, stated percentage 3.625%  
Notes Payable, Other Payables [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 3.20% 1.40%
Notes Payable, Other Payables [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member]    
Debt Instrument [Line Items]    
Notional amounts $ 1,000 $ 1,000
Interest rate, stated percentage 3.125%  
Notes Payable, Other Payables [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 1.80% 0.90%
Notes Payable, Other Payables [Member] | 2.60% notes due 2026 (2.60% 2026 notes) [Member]    
Debt Instrument [Line Items]    
Notional amounts $ 1,250 $ 1,250
Interest rate, stated percentage 2.60%  
Notes Payable, Other Payables [Member] | 2.60% notes due 2026 (2.60% 2026 notes) [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 1.80% 0.30%
Notes Payable, Other Payables [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member]    
Debt Instrument [Line Items]    
Notional amounts $ 1,500 $ 1,500
Interest rate, stated percentage 4.663%  
Notes Payable, Other Payables [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 2.60% 0.00%