Level 3 Analysis - Supplemental Data [Abstract]

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Fair Value Measurement - Level 3 Analysis (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Total debt and equity instruments
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 3 into level 2, liabilities	$ 9	$ 3	$ 12	$ 4
Transfers from level 2 into level 3, liabilities	0	7	59	93
Long-term debt
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 3 into level 2, liabilities	149	517	490	1,033
Transfers from level 2 into level 3, liabilities	7	608	18	978
Nontrading loans
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets			(571)
Transfers from level 3 into level 2, assets	328	322	568	353
Transfers from level 2 into level 3, assets	445	482	600	1,996
MSRs
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets			1,300
Recurring
Level 3 Analysis - Supplemental Data [Abstract]
Assets fair value	1,195,182		1,195,182		$ 1,243,209
Increase (decrease) in level 3 assets	(1,500)		(526)
Recurring \| Total debt and equity instruments
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 3 into level 2, liabilities		876	800	1,100
Transfers from level 2 into level 3, liabilities		657		2,800
Recurring \| Long-term debt
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 3 into level 2, liabilities		517		1,000
Transfers from level 2 into level 3, liabilities		608		978
Recurring \| Equity \| Derivative payables
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 3 into level 2, liabilities		646	1,100	965
Transfers from level 2 into level 3, liabilities		703		2,400
Recurring \| Interest rate \| Derivative payables
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 2 into level 3, liabilities				776
Recurring \| Derivative receivables \| Equity
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(979)		(490)
Transfers from level 3 into level 2, assets	1,000	854	1,300	1,100
Transfers from level 2 into level 3, assets		802		1,800
Recurring \| Derivative receivables \| Interest rate
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets			(458)
Recurring \| Level 3
Level 3 Analysis - Supplemental Data [Abstract]
Assets fair value	15,884		15,884		$ 16,410
Realized/unrealized gains (losses), assets	(1,300)	(43)	$ (282)	1,100
Realized/unrealized gains (losses), liabilities	$ (468)	$ (3,000)		$ 1,600