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Financing arrangements (Debt Issuances) (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Commercial paper, maximum borrowing capacity	$ 2,500,000,000
Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	5,000,000,000	$ 9,000,000,000
Notes [Member] | 1.65% notes due in 2028 (1.65% 2028 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,250,000,000
Interest rate, stated percentage	1.65%
Notes [Member] | 2.00% notes due 2032 (2.00% 2032 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,250,000,000
Interest rate, stated percentage	2.00%
Notes [Member] | 2.80% notes due 2041 (2.80% 2041 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,150,000,000
Interest rate, stated percentage	2.80%
Notes [Member] | 3.00% notes due 2052 (3.00% 2052 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,350,000,000
Interest rate, stated percentage	3.00%
Notes [Member] | 1.90% notes due 2025 (1.90% 2025 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 500,000,000
Interest rate, stated percentage	1.90%	1.90%
Notes [Member] | 2.20% notes due 2027 (2.20% 2027 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,750,000,000
Interest rate, stated percentage	2.20%	2.20%
Notes [Member] | 2.45% notes due 2030 (2.45% 2030 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,250,000,000
Interest rate, stated percentage	2.45%	2.45%
Notes [Member] | 2.30% notes due 2031 (2.30% 2031 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,250,000,000
Interest rate, stated percentage	2.30%	2.30%
Notes [Member] | 3.15% notes due 2040 (3.15% 2040 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 2,000,000,000
Interest rate, stated percentage	3.15%	3.15%
Notes [Member] | 3.375% notes due 2050 (3.375% 2050 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 2,250,000,000
Interest rate, stated percentage	3.375%	3.375%

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