Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Income Taxes
Goodwill impairment loss				$ 675,000,000
Income Tax Expense (Benefit)			$ 532,000,000	$ 348,000,000	$ 332,000,000
Effective Income Tax Rate Reconciliation, Percent			25.30%	28.90%	50.00%
Provision at Federal statutory rate			21.00%	21.00%	21.00%
Deferred income taxes and other liabilities	$ 8,035,000,000		$ 8,882,000,000	$ 8,035,000,000
Unrecognized tax benefits that would impact effective tax rate	882,000,000		871,000,000	882,000,000	$ 878,000,000
Effective Tax Rate Impact From Certain Foreign Jurisdictions			17,000,000
Undistributed Earnings of Foreign Subsidiaries			1,000,000,000.0
Deferred tax assets on tax credit carryforwards	(512,000,000)		(386,000,000)	(512,000,000)
Valuation allowance on operating loss carryforwards			244,000,000
Unrecognized tax benefits	981,000,000		879,000,000	981,000,000	1,015,000,000	$ 948,000,000
Unrecognized tax benefits, interest and penalties accrued	65,000,000		65,000,000	65,000,000	65,000,000
GMPD
Income Taxes
Goodwill impairment loss	$ 90,000,000	$ 585,000,000		675,000,000	1,200,000,000
Federal
Income Taxes
Tax credit carryforwards			154,000,000
State and Local
Income Taxes
Tax credit carryforwards			11,600,000,000
Foreign
Income Taxes
Tax credit carryforwards			$ 1,100,000,000
Total Opioid Litigation [Member]
Income Taxes
Litigation settlement					5,600,000,000
GMPD
Income Taxes
Income Tax Expense (Benefit)				$ (58,000,000)	$ (92,000,000)