Contingencies (Health Care Cost Recovery Litigation - 2003-2015 NPM Adjustment Disputes - Settlement with 26 States and Territories and Settlement with New York) (Details) $ in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2013 USD ($) state	Nov. 30, 1998 state	Dec. 31, 2017 USD ($) plantiff	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) plantiff	Dec. 31, 2012 state claims
Loss Contingencies [Line Items]
Payments made related to litigation			$ 21	$ 190	$ 57
Health Care Cost Recovery Actions, 2016 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			$ 296
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of states with settled litigation | state		46
Health Care Cost Recovery Actions [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states | plantiff			52
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			223
Health Care Cost Recovery Actions, 2014 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			246
Health Care Cost Recovery Actions, 2015 NPM Adjustments [Member]
Loss Contingencies [Line Items]
Estimate of possible gain			$ 292
Settled Litigation [Member] | Health Care Cost Recovery Actions [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Number of claims resolved | claims						2
Number of states with settled litigation | plantiff			27		170,000,000
Number of states with settled litigation, first settlement | plantiff			26
Loss contingency number of states with settled litigation including new york | state						19
Litigation settlement amount					$ 740
Pending Litigation [Member] | Health Care Cost Recovery Actions, 2003 NPM Adjustment [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states | state	15
Loss contingency, number of states that did not enforce escrow statutes | state	6
Loss contingency, number of disputes outstanding | state	2
Indiana and Kentucky [Member] | Settled Litigation [Member] | Health Care Cost Recovery Actions, 2003 NPM Adjustment [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Number of states with settled litigation | state	2
Maryland, Missouri, New Mexico and Pennsylvania [Member] | Pending Litigation [Member] | Health Care Cost Recovery Actions, 2003 NPM Adjustment [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Loss contingency, number of states that did not enforce escrow statutes | state	4
Cost of Sales [Member] | Pending Litigation [Member] | Health Care Cost Recovery Actions, 2003 NPM Adjustment [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Litigation settlement amount	$ 74