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Stockholders' equity (Stock Repurchase Program) (Details) - USD ($) shares in Millions		3 Months Ended												12 Months Ended
	Mar. 08, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 30, 2018	Jan. 31, 2018
Equity [Abstract]
Stock repurchases, Shares	52.1	11.1	8.7	18.2	56.4	4.5	4.4	6.2	3.4	6.7	4.4	3.9	4.7	94.5	18.5	19.7
Stock repurchases		$ 2,165,000,000	$ 1,713,000,000	$ 3,190,000,000	$ 10,787,000,000	$ 796,000,000	$ 769,000,000	$ 1,006,000,000	$ 555,000,000	$ 999,000,000	$ 747,000,000	$ 591,000,000	$ 690,000,000	$ 17,855,000,000	$ 3,126,000,000	$ 3,027,000,000
Stock repurchase program, additional authorized amount		3,600,000,000.0												3,600,000,000.0			$ 5,000,000,000.0	$ 10,000,000,000.0
Stock repurchase program, tender offer amount														10,000,000,000
Amount available for stock repurchases under a board approved stock repurchase plan		$ 5,100,000,000												$ 5,100,000,000

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- Definition

Stock Repurchase Program, Tender Offer Amount

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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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- Definition

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.

+ References

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-Publisher FASB
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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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