Investments in Equity Securities (JUUL Investment Classified as Level 3) (Details) - Equity Method Investments, Fair Value Option [Member] - JUUL [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 1,705	$ 1,705
Unrealized gains (losses) included in (income) losses from equity investments	(100)	0
Balance at end of period	$ 1,605	$ 1,705