Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	$ 78,412	$ 76,919
Loans Held-for-sale, Fair Value Disclosure	542	191
Derivative assets, gross amount	2,745	3,098
Derivative asset, netting adjustments	(1,250)	(1,134)
Derivative asset	$ 1,495	1,964
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Liabilities:
Derivative liabilities, gross amount	$ 3,556	4,550
Derivative liability, netting adjustments	(717)	(1,235)
Derivative liability	2,839	3,315
Net valuation allowance	2	4
Level 1
Assets:
Loans Held-for-sale, Fair Value Disclosure	0	0
Level 2
Assets:
Loans Held-for-sale, Fair Value Disclosure	669	11
Level 3
Assets:
Loans Held-for-sale, Fair Value Disclosure	0	0
Recurring
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	78,412	76,919
Loans Held-for-sale, Fair Value Disclosure	542	191
Derivative asset	1,495	1,964
Other assets	579	503
Total assets	81,028	79,577
Liabilities:
Derivative liability	2,839	3,315
Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	5,235	5,227
Loans Held-for-sale, Fair Value Disclosure	0	0
Derivative assets, gross amount	545	474
Other assets	540	464
Total assets	6,320	6,165
Other assets:
Deferred compensation plan assets	536	453
Liabilities:
Derivative liabilities, gross amount	482	823
Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	72,838	71,314
Loans Held-for-sale, Fair Value Disclosure	542	191
Derivative assets, gross amount	988	2,545
Other assets	3	3
Total assets	74,371	74,053
Liabilities:
Derivative liabilities, gross amount	1,926	3,653
Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	339	378
Loans Held-for-sale, Fair Value Disclosure	0	0
Derivative assets, gross amount	1,212	79	$ 131
Other assets	36	36
Total assets	1,587	493
Other assets:
Retained interests in securitizations	36	36
Liabilities:
Derivative liabilities, gross amount	1,148	74	$ 143
Recurring | Fair Value Inputs Level 1 And Level 2 [Member]
Other assets:
Equity securities	7	14
Liabilities:
Debt and Equity Securities, Unrealized Gain (Loss)	(1)	(23)
U.S. Treasury securities
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	5,110	5,041
U.S. Treasury securities | Recurring
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	5,110	5,041
U.S. Treasury securities | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	5,110	5,041
U.S. Treasury securities | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	0	0
U.S. Treasury securities | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	0	0
RMBS
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	63,518	62,589
RMBS | Recurring
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	63,518	62,589
RMBS | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	0	0
RMBS | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	63,312	62,353
RMBS | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	206	236
CMBS | Recurring
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	8,012	7,870
CMBS | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	0	0
CMBS | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	7,879	7,728
CMBS | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	133	142
Other securities
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	1,772	1,419
Other securities | Recurring
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	1,772	1,419
Other securities | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	125	186
Other securities | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	1,647	1,233
Other securities | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $88.4 billion and $87.0 billion and allowance for credit losses of $4 million and $3 million as of June 30, 2023 and December 31, 2022, respectively)	$ 0	$ 0