Investments in Equity Securities (Investment in Cronos Narrative) (Details) - Cronos [Member] $ / shares in Units, shares in Millions, $ in Millions, $ in Billions			1 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2019 CAD ($) $ / shares shares	Mar. 31, 2019 CAD ($) $ / shares shares	Dec. 31, 2021 USD ($) board_member director shares	Dec. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)
Investments [Line Items]
Equity method investment, ownership percentage (approximately)		45.00%	45.00%	41.80%		43.50%
Equity method investment, number of shares owned, common (in shares) | shares		149.8	149.8	156.6
Payments to acquire equity method investments and derivative instruments, investing	$ 1,800	$ 2.4	$ 2.4
Equity method investment, warrant exercised, ownership percentage				52.00%	52.00%
Number of directors nominated | director				4
Number of independent directors nominated | director				1
Number of members on the board of directors | board_member				7
Difference between carrying amount and underlying equity | $				$ 205		$ 77
Equity method investment, difference between carrying amount and fair value, percentage				(25.00%)	(25.00%)	(8.00%)
Equity method investments | $				$ 632		$ 1,173
Common Stock [Member]
Investments [Line Items]
Equity method investments | $				$ 617		$ 1,010
Equity Contract, Preemptive Rights [Member]
Investments [Line Items]
Equity method investment, price per share if exercised | $ / shares		$ 16.25	$ 16.25
Equity method investment, number of shares eligible for purchase | shares				12.0
Equity method investment, total exercise price				$ 200	$ 0.2
Equity Contract, Warrant [Member]
Investments [Line Items]
Equity method investment, price per share if exercised | $ / shares		$ 19.00	$ 19.00
Equity method investment, number of shares eligible for purchase | shares				83.0
Equity method investment, percentage of shares eligible for purchase		10.00%	10.00%
Equity method investment, total exercise price				$ 1,300	$ 1.6