Segment, Geographic and Revenue Information - Investment Management Investments Revenues - Net Unrealized Carried Interest (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Net cumulative unrealized carried interest at risk of reversing	$ 553	$ 434

Amount of accrued revenue earned by the entity based on the investment results achieved, net of any reversals.

No definition available.