Contingencies (NPM Adjustment Disputes) (Details) $ in Millions		1 Months Ended					3 Months Ended							12 Months Ended		123 Months Ended	315 Months Ended
	Apr. 22, 2024	Feb. 28, 2024 USD ($)	Aug. 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Mar. 31, 2022 USD ($)	Jan. 31, 2022 state	Mar. 31, 2024 USD ($) state	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 state
Loss Contingencies [Line Items]
Litigation settlement					$ 90
Loss contingency accrual, provision														$ 90
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Litigation settlement							$ 900			$ 900
PM USA [Member] | Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states with settled litigation including New York, subsequent expansion | state																	39
Loss contingency, credits to offset payments																$ 1,240
Litigation settlement, amount expected to be awarded from other party							$ 353
PM USA [Member] | Health Care Cost Recovery Actions [Member] | Settled Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states with settled litigation including New York, subsequent expansion | state						36
PM USA [Member] | Health Care Cost Recovery Actions, 2004 NPM Adjustment [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, credits to offset payments				$ 52
Loss contingency, number of states with concluded hearings | state							9
Loss contingency, number of states not in compliance with escrow statues | state							3
Loss contingency, number of states not settled | state							8
Loss contingency, damages sought, value											$ 8		$ 44
PM USA [Member] | Health Care Cost Recovery Actions, 2005-2007 NPM Adjustment [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states not settled | state							7
Loss contingency, reduction to cost of sales								$ 14
Litigation settlement interest expense (income)								$ (21)
PM USA [Member] | Health Care Cost Recovery Actions, 2005-2007 NPM Adjustment [Member] | Pending Litigation [Member] | Period One [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states not settled | state							6
Loss contingency, number of states not settled, arbitration period							3 years
PM USA [Member] | Health Care Cost Recovery Actions, 2005-2007 NPM Adjustment [Member] | Pending Litigation [Member] | Period One [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states not settled, arbitration period	3 years
PM USA [Member] | Health Care Cost Recovery Actions, 2005-2007 NPM Adjustment [Member] | Pending Litigation [Member] | Period Two [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states not settled | state							1
Loss contingency, number of states not settled, arbitration period							1 year
Illinois [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Litigation settlement												$ 80
Illinois [Member] | PM USA [Member] | Health Care Cost Recovery Actions, Transition Years 2019-2021 [Member] | Settled Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement												$ 20
Iowa [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, provision									$ 19
Iowa [Member] | PM USA [Member] | Health Care Cost Recovery Actions, Transition Years 2005-2022 [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement			$ 19
Iowa [Member] | PM USA [Member] | Health Care Cost Recovery Actions, Transition Years 2020-2022 [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement			$ 4
IDAHO [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Litigation settlement							$ 8
IDAHO [Member] | PM USA [Member] | Health Care Cost Recovery Actions, Transition Years 2005-2022 [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement		$ 8
IDAHO [Member] | PM USA [Member] | Health Care Cost Recovery Actions, Transition Years 2021-2023 | Pending Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement		$ 2
New York [Member] | PM USA [Member] | Health Care Cost Recovery Actions [Member] | Settled Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement															$ 503