Income Tax Expense - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2021	Jan. 01, 2021
Income Tax Disclosure [Line Items]
Increase to unrecognized tax benefits as a result of ongoing discussions with various taxing authorities		$ 8	$ 25
Net tax deficiencies				$ 12
Additional tax expense from re-measurement of deferred tax liabilities				$ 10
Unrecognized tax benefits		772	772
Penalties and interest accrued on unrecognized tax benefits		135	135
Potential payables related to unrecognized tax benefits		772	772
Tax Years 2008 Through 2012
Income Tax Disclosure [Line Items]
Additional tax		1,260	1,260
Internal Revenue Service (IRS) | Tax Years 2008 Through 2012
Income Tax Disclosure [Line Items]
Federal tax, subject to interest			340
Internal Revenue Service (IRS) | Tax Years 2013 Through 2015
Income Tax Disclosure [Line Items]
Additional tax		$ 343	$ 343
Penalties asserted	$ 109