Investments in Equity Securities (Investment in ABI Narrative) (Details) shares in Millions, $ in Millions			1 Months Ended	3 Months Ended		12 Months Ended
		Mar. 14, 2024 shares	Mar. 31, 2024 USD ($) shares	Mar. 31, 2024 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2024 USD ($) board_member shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 13, 2024 shares
Investments [Line Items]
Conversion of stock, shares converted (in shares) | shares		60.0
Proceeds from the ABI Transaction	[1]					$ 2,353	$ 0	$ 0
Equity method investments						$ 315
ABI [Member]
Investments [Line Items]
Equity method investment, ownership percentage (approximately)						8.10%			10.00%
Equity method investment, number of shares owned, restricted (in shares) | shares						125.0			185.0
Equity method investment, number of shares owned, common (in shares) | shares						34.0			12.0
Proceeds from the ABI Transaction				$ 2,400
Equity method investment, disposal, transaction costs				$ 62		$ 62
Pre-tax gain on partial sale of investment						408
Reclassification from AOCI						(243)
Partial release of a valuation allowance						$ 94
Number of board members | board_member						2
Equity method investments						$ 7,880	$ 9,676
Equity method investment, difference between carrying amount and fair value, percentage					(22.00%)		32.00%
Equity method investment, impairment					$ 2,500
Difference between carrying amount and underlying equity						2,000
Decrease in difference between carrying amount and underlying equity						500
ABI [Member] | Marketing Administration And Research Costs [Member]
Investments [Line Items]
Equity method investment, disposal, transaction costs						59
ABI [Member] | Interest Income (Expense), Net [Member]
Investments [Line Items]
Equity method investment, disposal, transaction costs						3
ABI [Member] | Secondary Offering [Member]
Investments [Line Items]
Sale of stock, number of shares issued in transaction (shares) | shares			35.0
Sale of stock, consideration received on transaction			$ 2,200
ABI [Member] | Private Placement [Member]
Investments [Line Items]
Sale of stock, number of shares issued in transaction (shares) | shares			3.3
Sale of stock, consideration received on transaction			$ 200
Level 1 [Member] | ABI [Member]
Investments [Line Items]
Fair value of investment						$ 7,900	$ 12,700
Equity method investment, difference between carrying amount and fair value					$ (2,500)

[1] See Note 8. Investments in Equity Securities.