Income Taxes (Details) € in Millions, $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 04, 2017 EUR (€)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Income Tax Disclosure [Abstract]
Provision for income taxes		$ 569	$ 494	$ 2,298	$ 1,588
Discrete tax benefits				1,500	1,000
Cash paid for income taxes, net of refunds		502	$ 241	1,293	$ 692	$ 1,481	$ 863
Tax contingencies		$ 3,000		$ 3,000		$ 3,000		$ 3,900
Luxembourg Tax Administration [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Tax examination, estimate of additional tax expense | €	€ 250