Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022		Mar. 31, 2021
Operating activities
Net income		$ 655		$ 796
Reconciliation of net income to net cash provided by operating activities
Depreciation and amortization		339		373
Provision for credit losses		167		(13)
Gain on mortgage and automotive loans, net		(14)		(36)
Other gain on investments, net		(5)		(123)
Loss on extinguishment of debt		0		1
Originations and purchases of loans held-for-sale		(1,355)		(1,175)
Proceeds from sales and repayments of loans held-for-sale		1,465		1,137
Net change in
Deferred income taxes		183		(19)
Interest payable		92		41
Other assets		214		78
Other liabilities		(122)		105
Other, net		22		5
Net cash provided by operating activities		1,641		1,170
Investing activities
Purchases of equity securities		(349)		(472)
Proceeds from sales of equity securities		548		589
Purchases of available-for-sale securities		(3,962)		(10,116)
Proceeds from sales of available-for-sale securities		474		2,327
Proceeds from repayments of available-for-sale securities		1,508		3,612
Purchases of held-to-maturity securities		0		(63)
Proceeds from repayments of held-to-maturity securities		59		118
Purchases of finance receivables and loans held-for-investment		(1,364)		(930)
Proceeds from sales of finance receivables and loans initially held-for-investment		1		164
Originations and repayments of finance receivables and loans held-for-investment and other, net		(2,240)		5,783
Purchases of operating lease assets		(946)		(1,269)
Disposals of operating lease assets		865		780
Net change in nonmarketable equity investments		(116)		29
Other, net		(163)		(100)
Net cash (used in) provided by investing activities		(5,685)		452
Financing activities
Net change in short-term borrowings		3,950		(2,136)
Net increase in deposits		916		2,545
Proceeds from issuance of long-term debt		1,059		56
Repayments of long-term debt		(2,222)		(1,340)
Repurchases of common stock		(584)		(219)
Common stock dividends paid		(104)		(73)
Preferred stock dividends paid		(28)		0
Net cash provided by (used in) financing activities		2,987		(1,167)
Effect of exchange-rate changes on cash and cash equivalents and restricted cash		2		2
Net (decrease) increase in cash and cash equivalents and restricted cash		(1,055)		457
Cash and cash equivalents and restricted cash at beginning of year		5,670		16,574
Cash and cash equivalents and restricted cash at March 31,		4,615		17,031
Cash paid for
Interest		292		492
Income taxes		21		4
Noncash items
Loans held-for-sale transferred to finance receivables and loans held-for-investment		25		4
Additions of property and equipment		0		46
Finance receivables and loans held-for-investment transferred to loans held-for-sale		0		329
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents on the Condensed Consolidated Balance Sheet		3,932	[1]	15,778
Restricted cash included in other assets on the Consolidated Balance Sheet	[2]	683		1,253
Total cash and cash equivalents and restricted cash in the Condensed Consolidated Statement of Cash Flows		$ 4,615		$ 17,031

[1] Refer to Note 7 for discussion of cash and cash equivalents and investment securities pledged as collateral.

[2] Restricted cash balances relate primarily to Ally securitization arrangements. Refer to Note 11 for additional details describing the nature of restricted cash balances.