Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 0
In-process research and development impairment	820,000,000	$ 0	$ 432,000,000
Cost of Goods Sold
Intangible Assets [Line Items]
Amortization of Intangible Assets	1,200,000,000	912,000,000	$ 844,000,000
Japan Tobacco
Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 550,000,000
Gadeta [Member]
Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired		$ 117,000,000