Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	$ 76,919	$ 95,261
Loans Held-for-sale, Fair Value Disclosure	191	1,000
Derivative assets, gross amount	3,098	2,690
Derivative asset, netting adjustments	(1,134)	(542)
Derivative asset	$ 1,964	2,148
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Liabilities:
Derivative liabilities, gross amount	$ 4,550	1,868
Derivative liability, netting adjustments	(1,235)	(544)
Derivative liability	3,315	1,324
Net valuation allowance	4	11
Level 1
Assets:
Loans Held-for-sale, Fair Value Disclosure	0	0
Level 2
Assets:
Loans Held-for-sale, Fair Value Disclosure	11	5,091
Level 3
Assets:
Loans Held-for-sale, Fair Value Disclosure	0	0
Recurring
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	76,919	95,261
Loans Held-for-sale, Fair Value Disclosure	191	1,026
Derivative asset	1,964	2,148
Other assets	503	573
Total assets	79,577	99,008
Liabilities:
Derivative liability	3,315	1,324
Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	5,227	9,648
Loans Held-for-sale, Fair Value Disclosure	0	0
Derivative assets, gross amount	474	406
Other assets	464	526
Total assets	6,165	10,580
Other assets:
Deferred compensation plan assets	453	490
Liabilities:
Derivative liabilities, gross amount	823	838
Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	71,314	85,346
Loans Held-for-sale, Fair Value Disclosure	191	1,026
Derivative assets, gross amount	2,545	2,200
Other assets	3	6
Total assets	74,053	88,578
Liabilities:
Derivative liabilities, gross amount	3,653	965
Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	378	267
Loans Held-for-sale, Fair Value Disclosure	0	0
Derivative assets, gross amount	79	84	$ 141
Other assets	36	41
Total assets	493	392
Other assets:
Retained interests in securitizations	36	41
Liabilities:
Derivative liabilities, gross amount	74	65	$ 110
Recurring | Fair Value Inputs Level 1 And Level 2 [Member]
Other assets:
Equity securities	14	42
Liabilities:
Debt and Equity Securities, Unrealized Gain (Loss)	(23)	(36)
U.S. Treasury securities
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	5,041	9,442
U.S. Treasury securities | Recurring
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	5,041	9,442
U.S. Treasury securities | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	5,041	9,442
U.S. Treasury securities | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	0	0
U.S. Treasury securities | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	0	0
RMBS
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	62,589	73,616
RMBS | Recurring
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	62,589	73,616
RMBS | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	0	0
RMBS | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	62,353	73,358
RMBS | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	236	258
CMBS | Recurring
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	7,870	9,369
CMBS | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	0	0
CMBS | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	7,728	9,360
CMBS | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	142	9
Other securities
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	1,419	2,834
Other securities | Recurring
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	1,419	2,834
Other securities | Recurring | Level 1
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	186	206
Other securities | Recurring | Level 2
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	1,233	2,628
Other securities | Recurring | Level 3
Assets:
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively)	$ 0	$ 0