Variable Interest Entities - Consolidated VIEs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Variable Interest Entity [Line Items]
Interest expense	$ 219	$ 231	$ 438	$ 465
Consolidated VIEs
Variable Interest Entity [Line Items]
Interest expense	$ 68	$ 75	$ 133	$ 153

Aggregate amount of interest expense on all borrowings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.7,8)
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Name:	us-gaap_InterestExpenseBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration