Income Taxes (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Valuation Allowance Rollforward [Roll Forward]
Balance at beginning of year	$ 2,256
Additions to valuation allowance charged to income tax expense	7
Releases of valuation allowance credited to income tax benefit	(94)
Foreign currency translation	(1)
Reductions to valuation allowance due to NJOY Transaction (no impact to earnings)	(4)
Balance at end of period	$ 2,164