Contingencies (NPM Adjustment Disputes) (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) state	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($) state	Dec. 31, 2015 USD ($)
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Litigation settlement	$ 1,100.0	$ 1,200.0	$ 3,200.0	$ 3,300.0
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						36
Loss contingency, credits to offset payments						$ 1,030.0
Litigation settlement, amount expected to be awarded from other party			320.0
PM USA [Member] | Health Care Cost Recovery Actions [Member] | Settled Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, number of additional states extended with settled litigation | state						35
PM USA [Member] | Health Care Cost Recovery Actions [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, number of additional states extended with settled litigation | state						1
PM USA [Member] | Health Care Cost Recovery Actions, 2004 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			$ 388.0
PM USA [Member] | Health Care Cost Recovery Actions, 2004 NPM Adjustment [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states not settled | state			10
Loss contingency, number of states with concluded hearings | state			9
Loss contingency, number of states not in compliance with escrow statues | state			2
Loss contingency, number of states in compliance with escrow statues | state			7
Loss contingency, damages sought, value	$ 23.0
PM USA [Member] | Health Care Cost Recovery Actions, 2004 NPM Adjustment [Member] | Pending Litigation [Member] | Cost of Sales [Member]
Loss Contingencies [Line Items]
Loss contingency, reduction to cost of sales			$ 21.0
PM USA [Member] | Health Care Cost Recovery Actions, 2005 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			181.0
PM USA [Member] | Health Care Cost Recovery Actions, 2006 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			154.0
PM USA [Member] | Health Care Cost Recovery Actions, 2007 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			185.0
PM USA [Member] | Health Care Cost Recovery Actions, 2008 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			250.0
PM USA [Member] | Health Care Cost Recovery Actions, 2009 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			211.0
PM USA [Member] | Health Care Cost Recovery Actions, 2010 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			218.0
PM USA [Member] | Health Care Cost Recovery Actions, 2011 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			166.0
PM USA [Member] | Health Care Cost Recovery Actions, 2012 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			214.0
PM USA [Member] | Health Care Cost Recovery Actions, 2013 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			224.0
PM USA [Member] | Health Care Cost Recovery Actions, 2014 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			258.0
PM USA [Member] | Health Care Cost Recovery Actions, 2015 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			313.0
PM USA [Member] | Health Care Cost Recovery Actions, 2016 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			292.0
PM USA [Member] | Health Care Cost Recovery Actions, 2017 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			302.0
PM USA [Member] | Health Care Cost Recovery Actions, 2018 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			325.0
PM USA [Member] | Health Care Cost Recovery Actions, 2019 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			444.0
PM USA [Member] | Health Care Cost Recovery Actions, 2020 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			$ 572.0
PM USA [Member] | Health Care Cost Recovery Actions, 2005-2007 NPM Adjustment | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states not settled | state			10
PM USA [Member] | Health Care Cost Recovery Actions, 2005-2007 NPM Adjustment | Pending Litigation [Member] | Period One
Loss Contingencies [Line Items]
Loss contingency, number of states not settled | state			9
Loss contingency, number of states not settled, arbitration period			3 years
PM USA [Member] | Health Care Cost Recovery Actions, 2005-2007 NPM Adjustment | Pending Litigation [Member] | Period Two
Loss Contingencies [Line Items]
Loss contingency, number of states not settled | state			1
Loss contingency, number of states not settled, arbitration period			1 year
New York [Member] | PM USA [Member] | Health Care Cost Recovery Actions, Transition Years 2004-2018 [Member] | Settled Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement							$ 373.0
MONTANA | PM USA [Member] | Settled Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement					$ 4.0