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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 | 9 Months Ended | 12 Months Ended | 25 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) | Oct. 31, 2017 USD ($) state | Sep. 30, 2013 USD ($) state | Nov. 30, 1998 state | Sep. 30, 2020 USD ($) state | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) state claim | Dec. 31, 2018 USD ($) settlement_development | Dec. 31, 2017 USD ($) settlement_development | Apr. 30, 2020 USD ($)
Health Care Cost Recovery Actions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of states with settled litigation | state |  |  |  |  |  | 46 |  |  |  |  |  |
PM USA [Member] | Health Care Cost Recovery Actions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, reduction to cost of sales |  |  |  |  |  |  |  | $ 52 |  | $ 209 | $ 39 |
Loss contingency, credits to offset payments |  |  |  |  |  |  | $ 361 |  |  |  |  |
Loss contingency, settlement agreement, payment period |  |  |  |  |  |  | 9 years |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 2 |  |  |
Number of states with settled litigation | state |  |  |  |  |  |  |  |  | 37 |  |  |
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 |  |  |  |  |  |  |  |
Loss contingency, number of settlement developments | settlement_development |  |  |  |  |  |  |  |  |  | 2 | 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 | $ 121 | $ 68 |  |  |  |  |  |  |  |  | $ 248
Loss contingency, number of additional states extended with settled litigation | state |  |  |  |  |  |  | 35 |  |  |  |  |
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 |  |  |  |  |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2004 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | $ 388 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2005 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 181 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2006 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 154 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2007 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 185 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2008 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 250 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2009 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 211 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2010 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 218 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2011 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 166 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2012 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 214 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2013 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 224 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2014 NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 258 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2015 NPM Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 313 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2016 NPM Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 305 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2017 NPM Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 297 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2018 NPM Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 340 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2019 NPM Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible gain |  |  |  |  |  |  |  |  | 441 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2004 And Subsequent NPM Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, credits to offset payments |  |  |  |  |  |  | $ 43 |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 317 |  |  |
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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