Parent Company Only Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets:
Cash and cash equivalents	$ 13,803	$ 14,586
Investment securities	120,054	127,959
Loans, amortized cost	74,250	66,276
Lease right-of-use assets	335	313
Other assets	3,082	1,791
Total assets	211,793	211,308
Liabilities and total equity
Long-term debt	5,370	2,570
Lease liabilities	413	388
Other liabilities	3,041	2,467
Total liabilities	195,498	194,699
SVBFG stockholders' equity	16,004	16,236
Total liabilities and total equity	211,793	211,308
Parent Company
Assets:
Cash and cash equivalents	2,258	2,324
Investment securities	491	731
Loans, amortized cost	1	1
Lease right-of-use assets	102	82
Other assets	475	387
Total assets	19,679	19,214
Liabilities and total equity
Long-term debt	3,370	2,570
Lease liabilities	135	113
Other liabilities	170	295
Total liabilities	3,675	2,978
SVBFG stockholders' equity	16,004	16,236
Total liabilities and total equity	19,679	19,214
Parent Company | Bank Subsidiary
Assets:
Investment in subsidiaries	15,456	14,795
Parent Company | Nonbank Subsidiaries
Assets:
Investment in subsidiaries	$ 896	$ 894