Income Taxes (Details) € in Millions, $ in Millions, kr in Billions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 SEK (kr)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)
Income Tax [Line Items]
Income tax expense (benefit)	$ 45	$ (48)	$ 208	$ 25
Effective tax rate (in percent)	18.00%	(23.00%)	18.00%	2.00%
Statutory income tax rate (in percent)			21.00%
Swedish Tax Agency
Income Tax [Line Items]
Total assessment, including penalties and interest, not recorded					$ 359	kr 3.5
French Tax Authority
Income Tax [Line Items]
Total assessment, including penalties and interest, not recorded							$ 625	€ 571