Financing arrangements - Debt Issuances (Details) - Notes - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 7,000	$ 5,000	$ 9,000
1.65% notes due in 2028 (1.65% 2028 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,250
Interest rate, stated percentage	1.65%	1.65%
2.00% notes due 2032 (2.00% 2032 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,250
Interest rate, stated percentage		2.00%
2.80% notes due 2041 (2.80% 2041 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,150
Interest rate, stated percentage		2.80%
3.00% notes due 2052 (3.00% 2052 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,350
Interest rate, stated percentage	3.00%	3.00%
1.90% notes due 2025 (1.90% 2025 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued			$ 500
Interest rate, stated percentage	1.90%		1.90%
2.20% notes due 2027 (2.20% 2027 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued			$ 1,750
Interest rate, stated percentage	2.20%		2.20%
2.45% notes due 2030 (2.45% 2030 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued			$ 1,250
Interest rate, stated percentage	2.45%	2.45%	2.45%
2.30% notes due 2031 (2.30% 2031 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued			$ 1,250
Interest rate, stated percentage	2.30%	2.30%	2.30%
3.15% notes due 2040 (3.15% 2040 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued			$ 2,000
Interest rate, stated percentage	3.15%		3.15%
3.375% notes due 2050 (3.375% 2050 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued			$ 2,250
Interest rate, stated percentage	3.375%		3.375%
3.00% notes due 2029 (3.00% 2029 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 750
Interest rate, stated percentage	3.00%
4.05% notes due 2029 (4.05% 2029 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,250
Interest rate, stated percentage	4.05%
3.35% notes due 2032 (3.35% 2032 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,000
Interest rate, stated percentage	3.35%
4.20% notes due 2033 (4.20% 2033 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 750
Interest rate, stated percentage	4.20%
4.20% notes due 2052 (4.20% 2052 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,000
Interest rate, stated percentage	4.20%
4.875% notes due 2053 (4.875% 2053 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,000
Interest rate, stated percentage	4.875%
4.40% notes due 2062 (4.40% 2062 Notes)
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,250
Interest rate, stated percentage	4.40%