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Stockholders' equity - Stock Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Oct. 31, 2022
Class of Stock [Line Items]
Stock repurchases, Shares	0.0	1.5	0.0	24.6	6.9	4.6	6.5	3.7	5.3	3.0	2.6	4.3	26.1	21.7	15.2
Stock repurchases	$ 0	$ 900	$ 0	$ 5,410	$ 1,461	$ 1,069	$ 1,592	$ 865	$ 1,221	$ 752	$ 591	$ 933	$ 6,310	$ 4,987	$ 3,497
Stock repurchase program, additional authorized amount																$ 2,400
Amount available for stock repurchases under a board approved stock repurchase plan	$ 7,000												7,000
Stock Repurchased and Retired During Period, Value													6,310	4,987	3,497
Accumulated deficit
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value													6,310	$ 4,987	$ 3,497
Common stock and additional paid-in capital
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value													$ 0
Accelerated stock repurchase agreement
Class of Stock [Line Items]
Stock repurchases, Shares	1.5			23.3									24.8
Stock repurchases				$ 6,000
Accelerated stock repurchase agreement | Accumulated deficit
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 900			5,100
Accelerated stock repurchase agreement | Common stock and additional paid-in capital
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value				$ 900

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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