Contingencies (NPM Adjustment Disputes - Settlement with 35 States and Territories and Settlement with New York) (Details) $ in Millions	1 Months Ended			3 Months Ended				6 Months Ended		12 Months Ended
	Apr. 30, 2018 USD ($)	Sep. 30, 2013 USD ($) state	Nov. 30, 1998 state	Jun. 30, 2018 USD ($) state	Mar. 31, 2018 USD ($) state	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) state claim	Jun. 30, 2017 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2012 USD ($) state
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of states with settled litigation | state			46
Litigation settlement				$ 1,000			$ 1,200	$ 2,000	$ 2,300
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
Loss contingency, reduction to cost of sales				90				$ 81
PM USA [Member] | Health Care Cost Recovery Actions [Member] | Settled Litigation [Member]
Loss Contingencies [Line Items]
Number of claims resolved | claim								2
Number of states with settled litigation | state								37
Loss contingency, number of states with settled litigation including new york | state											19
Loss contingency, number of states with settled litigation including New York, subsequent expansion | state								36
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 including New York, subsequent expansion | 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				90	$ 81
Payments received from litigation settlement	$ 68
PM USA [Member] | Health Care Cost Recovery Actions, 2015-2017 Transition Years [Member] | Settled Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement				13	$ 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
PM USA [Member] | Health Care Cost Recovery Actions, 2016 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Loss contingency, reduction to cost of sales						$ 39
PM USA [Member] | Health Care Cost Recovery Actions, 2017 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Loss contingency, reduction to cost of sales				$ 38
PM USA [Member] | Health Care Cost Recovery Actions, 2016 and 2017 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
Litigation settlement				$ 77