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Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions	Feb. 12, 2021	Jan. 11, 2021	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Total assets			$ 36,884	$ 33,252
Non-marketable equity securities			279	6,576
Capital contribution contingent on regulatory approval	$ 185
Term of contingent consideration (in years)	8 years
Loan receivable issued	$ 213
Call option period (in years)	2 years
Moove
Variable Interest Entity [Line Items]
Term loan receivable			210
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total assets			696	1,200
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total assets			2,800	$ 308
Aurora
Variable Interest Entity [Line Items]
Non-marketable equity securities			$ 2,300
CS Mexico
Variable Interest Entity [Line Items]
Ownership interest (percent)		55.00%
Moove
Variable Interest Entity [Line Items]
Ownership interest (percent)	30.00%
CS-Global | CS Mexico
Variable Interest Entity [Line Items]
Ownership interest (percent)		100.00%

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