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Investments in Equity Securities (Investment in ABI Narrative) (Details) shares in Millions, $ in Millions	3 Months Ended						12 Months Ended
	Dec. 31, 2019 USD ($) shares	Sep. 30, 2019 € / shares shares	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 € / shares	Oct. 31, 2016	Sep. 30, 2016
Investments [Line Items]
Equity method investments, recorded gain due to reduction of basis difference in assets							$ 1,725	$ 890	$ 532
Gain (loss) on ABI/SABMiller business combination			$ 0	$ 0	$ 0	$ (33)	$ 0	(33)	445
ABI [Member]
Investments [Line Items]
Equity method investment, ownership percentage (approximately)	10.10%						10.10%					27.00%
Equity method investment, number of shares owned, restricted (in shares) | shares	185.0						185.0
Equity method investment, number of shares owned, common (in shares) | shares	12.0						12.0
Difference between carrying amount and underlying equity	$ 11,800						$ 11,800
Equity method investments	18,071		17,696				$ 18,071	$ 17,696
Equity method investment, difference between carrying amount and fair value, percentage		(4.00%)					11.00%	26.00%
Gain from equity method investments relating to initial public offering of subsidiary	284
Equity method investments, recorded gain due to reduction of basis difference in assets							$ 1,229	$ 890	532
Derivative instrument, number of shares hedged (in shares) | shares		92.4
Derivative instrument, shares hedged, price per share (in eur per share) | € / shares		€ 87.42								€ 72.71
AB InBev and SABMiller [Member]
Investments [Line Items]
Equity method investment, ownership percentage (approximately)											9.60%
ABI [Member]
Investments [Line Items]
Gain (loss) on ABI/SABMiller business combination								(33)	$ 445
Restricted Stock [Member] | ABI [Member]
Investments [Line Items]
Restricted shares, lock-up period							5 years
Level 1 [Member] | ABI [Member]
Investments [Line Items]
Fair value of investment	$ 16,100		$ 13,100				$ 16,100	$ 13,100

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