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Contingencies (NPM Adjustment Disputes - Settlement with 20 States and Territories and Settlement with New York) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 29, 2021 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) | Oct. 31, 2017 USD ($) state | Sep. 30, 2013 USD ($) state | Nov. 30, 1998 state | Mar. 31, 2021 USD ($) state claim | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) state | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) settlement_development state | Dec. 31, 2017 USD ($)
Health Care Cost Recovery Actions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states with settled litigation | state |  |  |  |  |  |  | 46 |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  | $ 900.0 |  |  | $ 1,100.0 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, reduction to cost of sales |  |  |  |  |  |  |  |  |  |  |  | $ 52.0 | $ 209.0 | $ 39.0
Loss contingency, credits to offset payments |  |  |  |  |  |  |  |  |  | $ 361.0 |  |  |  |
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 |  |  |  |  |  |
Settlement agreements, number | claim |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Number of states with settled litigation | state |  |  |  |  |  |  |  | 38 |  |  |  |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2003-2015 NPM Adjustments [Member] | Settled Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of states with settled litigation including New York, subsequent expansion | state |  |  |  |  | 26 |  |  |  |  |  |  |  |  |
​Proceeds from legal settlements |  |  |  |  | $ 740.0 |  |  |  |  |  |  |  |  |
Loss contingency, number of settlement developments | settlement_development |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
PM USA [Member] | Health Care Cost Recovery Actions, 2004-2017 [Member] | Settled Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of additional states added | state |  |  |  |  |  |  |  |  |  |  |  |  | 10 |
Payments received from litigation settlement |  | $ 47.0 | $ 121.0 | $ 68.0 |  |  |  | $ 248.0 |  |  |  |  |  |
Loss contingency, number of additional states extended with settled litigation | state |  |  |  |  |  |  |  |  |  | 35 |  |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2004-2017 [Member] | Settled Litigation [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments received from litigation settlement | $ 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2003 NPM Adjustment [Member] | Settled Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states with settled litigation | state |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2003 NPM Adjustment [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of states | state |  |  |  |  |  | 15 |  |  |  |  |  |  |  |
Number of states without defense | state |  |  |  |  |  | 6 |  |  |  |  |  |  |  |
Loss contingency, number of disputes outstanding | state |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2003 NPM Adjustment [Member] | Pending Litigation [Member] | Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, reduction to cost of sales |  |  |  |  |  | $ 74.0 |  |  |  |  |  |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2004 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought, value |  | $ 13.8 |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  |  | $ 4.0 |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  | 388.0 |  |  |  |  |  |
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 |  |  |  |  |  |
New York [Member] | PM USA [Member] | Health Care Cost Recovery Actions, Transition Years 2004-2018 [Member] | Settled Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
​Proceeds from legal settlements |  |  |  |  |  |  |  | $ 373.0 |  |  |  |  |  |
Maryland, Missouri, New Mexico and Pennsylvania [Member] | PM USA [Member] | Health Care Cost Recovery Actions, 2003 NPM Adjustment [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of states remaining | state |  |  |  |  |  | 4 |  |  |  |  |  |  |  |

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