Income Taxes (Details 2) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Reserves not yet deducted for tax purposes	$ 3,637	$ 3,905
Employee compensation and benefits	359	383
Net operating loss and tax credit carryforwards	398	399
Other	809	765
Gross deferred tax assets	5,203	5,452
Valuation allowance	(472)	(418)
Deferred tax assets after valuation allowance	4,731	5,034
Deferred tax liabilities:
Intangibles and fixed assets	1,320	1,433
Deferred revenue	189	252
Deferred interest	133	148
Investment in joint ventures	183	135
Other	521	366
Gross deferred tax liabilities	2,346	2,334
Net deferred tax assets	$ 2,385	$ 2,700