Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	$ 81,925	$ 76,919
Loans Held-for-sale, Fair Value Disclosure	358	191
Derivative assets, gross amount	2,652	3,098
Derivative asset, netting adjustments	(1,026)	(1,134)
Derivative asset	$ 1,626	1,964
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Liabilities:
Derivative liabilities, gross amount	$ 3,200	4,550
Derivative liability, netting adjustments	(636)	(1,235)
Derivative liability	2,564	3,315
Net valuation allowance	3	4
Level 1
Assets:
Loans Held-for-sale, Fair Value Disclosure	0	0
Level 2
Assets:
Loans Held-for-sale, Fair Value Disclosure	5	11
Level 3
Assets:
Loans Held-for-sale, Fair Value Disclosure	0	0
Recurring
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	81,925	76,919
Loans Held-for-sale, Fair Value Disclosure	358	191
Derivative asset	1,626	1,964
Other assets	560	503
Total assets	84,469	79,577
Liabilities:
Derivative liability	2,564	3,315
Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	5,351	5,227
Loans Held-for-sale, Fair Value Disclosure	0	0
Derivative assets, gross amount	523	474
Other assets	520	464
Total assets	6,394	6,165
Other assets:
Deferred compensation plan assets	515	453
Liabilities:
Derivative liabilities, gross amount	526	823
Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	76,182	71,314
Loans Held-for-sale, Fair Value Disclosure	358	191
Derivative assets, gross amount	1,292	2,545
Other assets	4	3
Total assets	77,836	74,053
Liabilities:
Derivative liabilities, gross amount	1,855	3,653
Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	392	378
Loans Held-for-sale, Fair Value Disclosure	0	0
Derivative assets, gross amount	837	79	$ 202
Other assets	36	36
Total assets	1,265	493
Other assets:
Retained interests in securitizations	36	36
Liabilities:
Derivative liabilities, gross amount	819	74	$ 180
Recurring | Fair Value Inputs Level 1 And Level 2 [Member]
Other assets:
Equity securities	9	14
Liabilities:
Debt and Equity Securities, Unrealized Gain (Loss)	0	(23)
U.S. Treasury securities
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	5,163	5,041
U.S. Treasury securities | Recurring
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	5,163	5,041
U.S. Treasury securities | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	5,163	5,041
U.S. Treasury securities | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	0	0
U.S. Treasury securities | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	0	0
RMBS
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	66,351	62,589
RMBS | Recurring
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	66,351	62,589
RMBS | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	0	0
RMBS | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	66,104	62,353
RMBS | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	247	236
CMBS | Recurring
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	8,429	7,870
CMBS | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	0	0
CMBS | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	8,284	7,728
CMBS | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	145	142
Other securities
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	1,982	1,419
Other securities | Recurring
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	1,982	1,419
Other securities | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	188	186
Other securities | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	1,794	1,233
Other securities | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively)	$ 0	$ 0