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Investments - Concentration of Equity (Details) - Stockholders' Equity, Total - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Wheels Donlen
Concentration Risk [Line Items]
Investments	$ 1,437	$ 1,288
PK AirFinance
Concentration Risk [Line Items]
Investments	1,445	999
Athora
Concentration Risk [Line Items]
Investments	1,308	1,232
Atlas
Concentration Risk [Line Items]
Investments	1,004
Athora1
Concentration Risk [Line Items]
Investments	877	896
Atlas1
Concentration Risk [Line Items]
Investments	1,362	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
AT&T Inc.
Concentration Risk [Line Items]
Investments	$ 1,509

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481027/954-310-50-2

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(h))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

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