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Stockholders' equity (Stock Repurchase Program) (Details) - USD ($) shares in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Stock repurchases, Shares	5.3	3.0	2.6	4.3	5.1	6.2	13.1	15.9	11.1	8.7	18.2	56.4	15.2	40.2	94.5
Stock repurchases	$ 1,221,000,000	$ 752,000,000	$ 591,000,000	$ 933,000,000	$ 1,090,000,000	$ 1,170,000,000	$ 2,349,000,000	$ 3,031,000,000	$ 2,165,000,000	$ 1,713,000,000	$ 3,190,000,000	$ 10,787,000,000	$ 3,497,000,000	$ 7,640,000,000	$ 17,855,000,000
Stock repurchase program, additional authorized amount					$ 4,000,000,000.0									$ 4,000,000,000.0
Amount available for stock repurchases under a board approved stock repurchase plan	$ 3,000,000,000.0												$ 3,000,000,000.0

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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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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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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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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