Investments - Concentration of Equity (Details) - Stockholders' Equity, Total - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Wheels Donlen
Concentration Risk [Line Items]
Investments	$ 1,419	$ 1,288
PK AirFinance
Concentration Risk [Line Items]
Investments	1,334	999
Athora
Concentration Risk [Line Items]
Investments	1,279	1,232
Atlas
Concentration Risk [Line Items]
Investments	995
AP Tundra
Concentration Risk [Line Items]
Investments	873	896
MFI Investments
Concentration Risk [Line Items]
Investments	$ 869	878
SoftBank Vision Fund II
Concentration Risk [Line Items]
Investments		789
MidCap
Concentration Risk [Line Items]
Investments		788
Cayman Universe
Concentration Risk [Line Items]
Investments		$ 756