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Income taxes (Textual) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax Credit Carryforward [Line Items]
Interest and penalties related to unrecognized tax benefits recognized in income tax provision	$ 116,000,000	$ 198,000,000	$ 137,000,000
Accrued interest and penalties associated with unrecognized tax benefits	783,000,000	667,000,000
Income taxes paid	1,400,000,000	$ 1,900,000,000	$ 1,900,000,000
Federal [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards available to reduce income taxes	20,000,000
NOL carryforwards available to reduce income taxes	143,000,000
NOL carryforwards, valuation allowance	6,000,000
Federal [Member] | Operating Losses That Expire Between 2021 and 2035 [Member]
Tax Credit Carryforward [Line Items]
NOL carryforwards, valuation allowance	0
Federal [Member] | Expiration in tax years between 2023 and 2035 [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, valuation allowance	0
State [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards available to reduce income taxes	681,000,000
Tax credit carryforwards, valuation allowance	585,000,000
NOL carryforwards available to reduce income taxes	167,000,000
Foreign [Member]
Tax Credit Carryforward [Line Items]
NOL carryforwards available to reduce income taxes	1,900,000,000
NOL carryforwards, valuation allowance	754,000,000
NOLs with no valuation allowance and no expiration	861,000,000
Foreign [Member] | Operating Losses That Expire Between 2021 and 2030 [Member]
Tax Credit Carryforward [Line Items]
NOL carryforwards, valuation allowance	$ 0

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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