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Income taxes (Textual) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income taxes paid	$ 1,900,000,000	$ 1,500,000,000	$ 1,100,000,000
Tax Credit Carryforward [Line Items]
Interest and penalties related to unrecognized tax benefits recognized in income tax provision	137,000,000	56,000,000	$ 125,000,000
Accrued interest and penalties associated with unrecognized tax benefits	469,000,000	$ 332,000,000
Federal [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards available to reduce income taxes	20,000,000
Tax credit carryforwards, valuation allowance	0
NOL carryforwards available to reduce income taxes	145,000,000
NOL carryforwards, valuation allowance	6,000,000
Federal [Member] | Operating Losses That Expire Between 2020 and 2035 [Member]
Tax Credit Carryforward [Line Items]
NOL carryforwards, valuation allowance	0
State [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards available to reduce income taxes	556,000,000
Tax credit carryforwards, valuation allowance	444,000,000
NOL carryforwards available to reduce income taxes	287,000,000
NOL carryforwards, valuation allowance	263,000,000
State [Member] | Expiration in tax years beginning 2022 [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, valuation allowance	0
State [Member] | Operating Losses That Expire Between 2019 and 2032 [Member]
Tax Credit Carryforward [Line Items]
NOL carryforwards, valuation allowance	0
Foreign [Member]
Tax Credit Carryforward [Line Items]
NOL carryforwards available to reduce income taxes	1,800,000,000
NOL carryforwards, valuation allowance	485,000,000
NOLs with no valuation allowance and no expiration	620,000,000
Foreign [Member] | Operating Losses With No Expiry [Member]
Tax Credit Carryforward [Line Items]
NOL carryforwards, valuation allowance	$ 0

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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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