Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Unrecognized tax benefits if recognized would impact effective tax rate	$ 47	$ 40
Unrecognized tax benefits if recognized would affect deferred taxes	27	24
Interest (income) expense associated with uncertain tax position	4	6	$ 5
Potential decrease in liability for uncertain tax positions	8
Provision for income taxes	2,436	2,064	2,374
Effective income tax rate reconciliation, Tax Cuts and Jobs Act, transition tax on accumulated foreign earnings, amount		84	14
Effective income tax rate reconciliation, Tax Cuts and Jobs Act, tax credit, foreign		38	34
Tax Cuts and Jobs Act, change in tax rate, income tax expense (benefit)			188
Effective income tax rate reconciliation, Tax Cuts and Jobs Act, transition tax on accumulated foreign earnings, amount			$ 140
Audit Adjustments Prior Year Tax Audits [Member]
Income Taxes [Line Items]
Tax benefit recorded		105
Accruals no longer required [Member]
Income Taxes [Line Items]
Tax benefit recorded		100
Equity Method Investments [Member]
Income Taxes [Line Items]
Tax benefit recorded		79
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating losses carry forward	808
JUUL [Member]
Income Taxes [Line Items]
Provision for income taxes	612
Valuation allowance release	24
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount	2,610	$ 2,024
Cronos Group Inc. [Member]
Income Taxes [Line Items]
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount	$ 121