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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets:
Securities available for sale	$ 79,213	$ 46,150
Loans held for sale	251
Derivative assets, gross amount	1,729	1,539
Derivative asset, netting adjustments	(633)	(1,079)
Derivative asset	1,096	460
Liabilities:
Derivative liabilities, gross amount	1,197	1,201
Derivative liability, netting adjustments	(523)	(287)
Derivative liability	674	914
Net valuation allowance	12	2
Level 1
Assets:
Loans held for sale	0	0
Level 2
Assets:
Loans held for sale	149	1,218
Level 3
Assets:
Loans held for sale	0	0
Recurring
Assets:
Securities available for sale	79,213	46,150
Loans held for sale	251
Derivative asset	1,096	460
Other assets	410	423
Total assets	80,970	47,033
Liabilities:
Derivative liability	674	914
Recurring | Level 1
Assets:
Securities available for sale	4,355	6,363
Loans held for sale	0
Derivative assets, gross amount	84	0
Other assets	344	265
Total assets	4,783	6,628
Other assets:
Deferred compensation plan assets	343	264
Equity securities	1	1
Liabilities:
Derivative liabilities, gross amount	17	0
Recurring | Level 2
Assets:
Securities available for sale	74,416	39,344
Loans held for sale	251
Derivative assets, gross amount	1,568	1,501
Other assets	0	0
Total assets	76,235	40,845
Liabilities:
Derivative liabilities, gross amount	1,129	1,153
Recurring | Level 3
Assets:
Securities available for sale	442	443
Loans held for sale	0
Derivative assets, gross amount	77	38	$ 37
Other assets	66	158
Total assets	585	639
Other assets:
Retained interests in securitizations	66	158
Liabilities:
Derivative liabilities, gross amount	51	48	$ 24
U.S. Treasury securities
Assets:
Securities available for sale	4,124	6,144
U.S. Treasury securities | Recurring
Assets:
Securities available for sale	4,124	6,144
U.S. Treasury securities | Recurring | Level 1
Assets:
Securities available for sale	4,124	6,144
U.S. Treasury securities | Recurring | Level 2
Assets:
Securities available for sale	0	0
U.S. Treasury securities | Recurring | Level 3
Assets:
Securities available for sale	0	0
RMBS
Assets:
Securities available for sale	64,338	33,645
RMBS | Recurring
Assets:
Securities available for sale	64,338	33,645
RMBS | Recurring | Level 1
Assets:
Securities available for sale	0	0
RMBS | Recurring | Level 2
Assets:
Securities available for sale	63,909	33,212
RMBS | Recurring | Level 3
Assets:
Securities available for sale	429	433
CMBS | Recurring
Assets:
Securities available for sale	9,426	4,739
CMBS | Recurring | Level 1
Assets:
Securities available for sale	0	0
CMBS | Recurring | Level 2
Assets:
Securities available for sale	9,413	4,729
CMBS | Recurring | Level 3
Assets:
Securities available for sale	13	10
Other securities
Assets:
Securities available for sale	1,325	1,622
Other securities | Recurring
Assets:
Securities available for sale	1,325	1,622
Other securities | Recurring | Level 1
Assets:
Securities available for sale	231	219
Other securities | Recurring | Level 2
Assets:
Securities available for sale	1,094	1,403
Other securities | Recurring | Level 3
Assets:
Securities available for sale	$ 0	$ 0

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