Long-Term Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term finance leases	$ 167	$ 135
Total long-term debt	14,996	13,475
Fair Value Hedges
Debt Instrument [Line Items]
Decrease in carrying value of long-term debt	$ 282	450
Senior notes | 3.55% notes due 2025
Debt Instrument [Line Items]
Interest rate on debt	3.55%
Senior notes | 3.7% notes due in 2023
Debt Instrument [Line Items]
Interest rate on debt	3.70%
Senior notes | 3.3% notes due 2024
Debt Instrument [Line Items]
Interest rate on debt	3.30%
Senior notes | 2.400% notes due 2030
Debt Instrument [Line Items]
Interest rate on debt	2.40%
Senior notes | 2.65% notes due 2026
Debt Instrument [Line Items]
Interest rate on debt	2.65%
Senior notes | 7.35% notes due 2026
Debt Instrument [Line Items]
Interest rate on debt	7.35%
Subordinated notes | 3.1% subordinated notes due 2023
Debt Instrument [Line Items]
Interest rate on debt	3.10%
Fixed-to-floating rate senior notes | 2.354% notes due 2025
Debt Instrument [Line Items]
Interest rate on debt	2.354%
Fixed-to-floating rate senior notes | 4.164% notes due 2033
Debt Instrument [Line Items]
Interest rate on debt	4.164%
Fixed-to-floating rate senior notes | 2.203% notes due 2028
Debt Instrument [Line Items]
Interest rate on debt	2.203%
Fixed-to-floating rate senior notes | 4.141% notes due 2029
Debt Instrument [Line Items]
Interest rate on debt	4.141%
Fixed-to-floating rate senior notes | 5.751% notes due 2026
Debt Instrument [Line Items]
Interest rate on debt	5.751%
Fixed-to-floating rate senior notes | 3.152% notes due 2031
Debt Instrument [Line Items]
Interest rate on debt	3.152%
Fixed-to-floating rate senior notes | 5.82% notes due 2028
Debt Instrument [Line Items]
Interest rate on debt	5.82%
Fixed-to-floating rate senior notes | 4.421% notes due 2033
Debt Instrument [Line Items]
Interest rate on debt	4.421%
Fixed-to-floating rate senior notes | 1.684% notes due 2027
Debt Instrument [Line Items]
Interest rate on debt	1.684%
Fixed-to-floating rate senior notes | 3.776% notes due 2024
Debt Instrument [Line Items]
Interest rate on debt	3.776%
Fixed-to-floating rate senior notes | 2.901% notes due 2026
Debt Instrument [Line Items]
Interest rate on debt	2.901%
Fixed-to-floating rate senior notes | 2.623% notes due 2023
Debt Instrument [Line Items]
Interest rate on debt	2.623%
Fixed-to-floating rate senior notes | 1.746% notes due 2026
Debt Instrument [Line Items]
Interest rate on debt	1.746%
Fixed-to-floating rate senior notes | 2.653% notes due 2023
Debt Instrument [Line Items]
Interest rate on debt	2.653%
Fixed-to-floating rate senior notes | 2.825% notes due 2023
Debt Instrument [Line Items]
Interest rate on debt	2.825%
Senior subordinated notes | 2.200% notes due 2031
Debt Instrument [Line Items]
Interest rate on debt	2.20%
Fixed-to-floating rate senior subordinated notes | 3.031% notes due 2034
Debt Instrument [Line Items]
Interest rate on debt	3.031%
Parent Company and Non-banking Subsidiaries | Senior notes | 3.55% notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 1,256	1,370
Parent Company and Non-banking Subsidiaries | Senior notes | 3.7% notes due in 2023
Debt Instrument [Line Items]
Long-term debt	985	1,043
Parent Company and Non-banking Subsidiaries | Senior notes | 3.3% notes due 2024
Debt Instrument [Line Items]
Long-term debt	962	1,040
Parent Company and Non-banking Subsidiaries | Senior notes | 2.400% notes due 2030
Debt Instrument [Line Items]
Long-term debt	797	803
Parent Company and Non-banking Subsidiaries | Senior notes | 2.65% notes due 2026
Debt Instrument [Line Items]
Long-term debt	709	779
Parent Company and Non-banking Subsidiaries | Senior notes | 7.35% notes due 2026
Debt Instrument [Line Items]
Long-term debt	150	150
Parent Company and Non-banking Subsidiaries | Subordinated notes | 3.1% subordinated notes due 2023
Debt Instrument [Line Items]
Long-term debt	1,006	1,022
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 2.354% notes due 2025
Debt Instrument [Line Items]
Long-term debt	951	1,019
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 4.164% notes due 2033
Debt Instrument [Line Items]
Long-term debt	677	0
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 2.203% notes due 2028
Debt Instrument [Line Items]
Long-term debt	589	0
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 4.141% notes due 2029
Debt Instrument [Line Items]
Long-term debt	564	583
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 5.751% notes due 2026
Debt Instrument [Line Items]
Long-term debt	498	0
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 3.152% notes due 2031
Debt Instrument [Line Items]
Long-term debt	498	498
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 5.82% notes due 2028
Debt Instrument [Line Items]
Long-term debt	497	0
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 4.421% notes due 2033
Debt Instrument [Line Items]
Long-term debt	497	0
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 1.684% notes due 2027
Debt Instrument [Line Items]
Long-term debt	497	497
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 3.776% notes due 2024
Debt Instrument [Line Items]
Long-term debt	492	523
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 2.901% notes due 2026
Debt Instrument [Line Items]
Long-term debt	473	498
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 2.623% notes due 2023
Debt Instrument [Line Items]
Long-term debt	466	0
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 1.746% notes due 2026
Debt Instrument [Line Items]
Long-term debt	280	0
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 2.653% notes due 2023
Debt Instrument [Line Items]
Long-term debt	0	754
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior notes | 2.825% notes due 2023
Debt Instrument [Line Items]
Long-term debt	0	749
Parent Company and Non-banking Subsidiaries | Senior subordinated notes | 2.200% notes due 2031
Debt Instrument [Line Items]
Long-term debt	844	843
Parent Company and Non-banking Subsidiaries | Fixed-to-floating rate senior subordinated notes | 3.031% notes due 2034
Debt Instrument [Line Items]
Long-term debt	532	541
Parent Company and Non-banking Subsidiaries | Junior subordinated debentures | Floating-rate subordinated debentures due 2047
Debt Instrument [Line Items]
Long-term debt	500	499
Parent Company and Non-banking Subsidiaries | Junior subordinated debentures | Floating-rate subordinated notes due to State Street Capital Trust I in 2028
Debt Instrument [Line Items]
Long-term debt	100	100
State Street Bank
Debt Instrument [Line Items]
Long-term finance leases	$ 176	$ 164