Income Taxes (Details 2) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Reserves not yet deducted for tax purposes	$ 2,633	$ 2,612
Employee compensation and benefits	365	360
Other	536	431
Gross deferred tax assets	3,534	3,403
Valuation allowance	(66)	(61)
Deferred tax assets after valuation allowance	3,468	3,342
Deferred tax liabilities:
Intangibles and fixed assets	1,279	1,083
Deferred revenue	315	435
Deferred interest	162	171
Investment in joint ventures	122	137
Other	129	210
Gross deferred tax liabilities	2,007	2,036
Net deferred tax assets	$ 1,461	$ 1,306