Income Taxes Intellectual Property Transfer (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Examination [Line Items]
Income tax benefit (expense)		$ (1,312)	$ 59	$ (1,248)	$ 96
IP Transfer VA Release
Income Tax Examination [Line Items]
Income tax benefit (expense)		870
IP Transfer Tax Basis Step-Up
Income Tax Examination [Line Items]
Income tax benefit (expense)		445
IP Transfer Tax Incentive
Income Tax Examination [Line Items]
Income Tax Credits and Adjustments		65
IP Transfer and Tax Incentive Total Benefit
Income Tax Examination [Line Items]
Income tax benefit (expense)		$ 1,360
IP Transfer and Tax Incentive Total Benefit | Forecast [Member]
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 360