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Contingencies (2003-2015 NPM Adjustment Disputes - Settlement with 35 States and Territories and Settlement with New York) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 USD ($) state | Nov. 30, 1998 state | Mar. 31, 2018 USD ($) state | Mar. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2012 state claims
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, reduction to cost of sales |  |  | $ 81 |  |  |
Health Care Cost Recovery Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of states with settled litigation | state |  | 46 |  |  |  |
Litigation settlement |  |  | 1,000 | $ 1,100 |  |
Health Care Cost Recovery Actions, 2004 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 388 |  |  |
Health Care Cost Recovery Actions, 2005 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 181 |  |  |
Health Care Cost Recovery Actions, 2006 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 154 |  |  |
Health Care Cost Recovery Actions, 2007 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 185 |  |  |
Health Care Cost Recovery Actions, 2008 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 250 |  |  |
Health Care Cost Recovery Actions, 2009 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 211 |  |  |
Health Care Cost Recovery Actions, 2010 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 218 |  |  |
Health Care Cost Recovery Actions, 2011 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 166 |  |  |
Health Care Cost Recovery Actions, 2012 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 214 |  |  |
Health Care Cost Recovery Actions, 2013 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 224 |  |  |
Health Care Cost Recovery Actions, 2014 NPM Adjustment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 253 |  |  |
Health Care Cost Recovery Actions, 2015 NPM Adjustments [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 300 |  |  |
Health Care Cost Recovery Actions, 2016 NPM Adjustments [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | 295 |  |  |
Health Care Cost Recovery Actions, 2017 NPM Adjustments [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible gain |  |  | $ 288 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, number of states | state |  |  | 52 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions [Member] | Settled Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of claims resolved | claims |  |  |  |  |  | 2
Number of states with settled litigation | state |  |  | 36 |  |  |
Loss contingency number of states with settled litigation including new york | state |  |  |  |  |  | 19
Loss contingency, number of states with settled litigation, settlement one | state |  |  | 35 |  |  |
Litigation settlement |  |  |  |  | $ 217 |
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, settlement one | state |  |  | 26 |  |  |
Litigation settlement |  |  | $ 740 |  |  |
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 |  |  | 9 |  |  |
Litigation settlement |  |  | $ 81 |  |  |
PM USA [Member] | Health Care Cost Recovery Actions, 2015-2017 Transition Years [Member] | Settled Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement |  |  | $ 13 |  |  |
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 that did not diligently enforcing escrow statutes | state | 6 |  |  |  |  |
Loss contingency, number of states remaining | state | 4 |  |  |  |  |
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] |  |  |  |  |  |
Litigation settlement | $ 74 |  |  |  |  |

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