Contingencies (Other Litigation) (Details) - Other Litigation [Member] ฿ in Millions, $ in Millions, ₽ in Billions, ₩ in Billions						1 Months Ended										3 Months Ended			5 Months Ended		12 Months Ended
	Feb. 18, 2020	Jan. 26, 2017 USD ($)	Jan. 26, 2017 THB (฿)	Jan. 18, 2016 USD ($) defendant	Jan. 18, 2016 THB (฿) defendant	Jun. 30, 2020 USD ($)	Jun. 30, 2020 KRW (₩)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 THB (฿)	Jan. 31, 2020 USD ($)	Jan. 31, 2020 KRW (₩)	Nov. 30, 2019 USD ($)	Nov. 30, 2019 THB (฿)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 RUB (₽)	Sep. 30, 2019 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2017 KRW (₩)	Mar. 31, 2017 USD ($)	Mar. 31, 2017 KRW (₩)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 KRW (₩)
Thailand [Member] | The Department of Special Investigations of the Government of Thailand [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value		$ 624.0	฿ 19,800
Amount of fine imposed by trial court								$ 4.1	฿ 130			$ 37.9	฿ 1,200
Korea [Member] | The South Korean Board Of Audit And Inspection [Member]
Loss Contingencies [Line Items]
Amounts paid																	$ 143.3	₩ 172	$ 227.0	₩ 272	$ 83.3	₩ 100
Amount of taxes not underpaid as ruled by trial court										$ 181.6	₩ 218
Amount of alleged underpayments not underpaid as ruled by court						$ 45.0	₩ 54
Eastern Europe [Member] | The Moscow Tax Inspectorate for Major Taxpayers Audit [Member]
Loss Contingencies [Line Items]
Amount of alleged underpayment of excise taxes and VAT claimed by tax authority, including penalties and interest														$ 374.0	₽ 24.3
Amount of pre-tax charge related to alleged underpayment of excise taxes and VAT claimed by tax authority, including penalties and interest																$ 374.0
Amount of after-tax charge related to alleged underpayment of excise taxes and VAT claimed by tax authority, including penalties and interest																$ 315.0
United States [Member] | Philip Morris International Inc. Securities Litigation [Member]
Loss Contingencies [Line Items]
Number of days for plaintiffs to replead claim	30 days
Pending Litigation [Member] | Thailand [Member] | The Department of Special Investigations of the Government of Thailand [Member]
Loss Contingencies [Line Items]
Number of defendants | defendant				8	8
Loss contingency, damages sought, value				$ 2,600.0	฿ 80,800