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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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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-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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Total debt and equity instruments
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 2 into level 3, liabilities	$ 3	$ 3	$ 62	$ 96
Transfers from level 3 into level 2, liabilities	1	4	13	8
Long-term debt
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 2 into level 3, liabilities	11	78	29	1,056
Transfers from level 3 into level 2, liabilities	246	88	736	1,121
Nontrading loans
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 2 into level 3, assets	427	316	1,027	2,312
Transfers from level 3 into level 2, assets	105	169	673	522
Recurring
Level 3 Analysis - Supplemental Data [Abstract]
Assets fair value	1,193,119		1,193,119		$ 1,243,209
Increase (decrease) in level 3 assets	1,200		697
Recurring \| Total debt and equity instruments
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 2 into level 3, liabilities			882
Transfers from level 3 into level 2, liabilities			1,100
Recurring \| Long-term debt
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 2 into level 3, liabilities				1,100
Transfers from level 3 into level 2, liabilities			736	1,100
Recurring \| MSRs
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	802		2,100
Recurring \| Nontrading loans
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 2 into level 3, assets			1,000	2,300
Transfers from level 3 into level 2, assets			673
Recurring \| Interest rate \| Derivative receivables
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets			(444)
Recurring \| Equity \| Derivative payables
Level 3 Analysis - Supplemental Data [Abstract]
Transfers from level 2 into level 3, liabilities			704	2,700
Transfers from level 3 into level 2, liabilities		965	1,600	1,900
Recurring \| Equity \| Derivative receivables
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets			(443)
Transfers from level 2 into level 3, assets			937	2,200
Transfers from level 3 into level 2, assets			1,700	1,700
Recurring \| Level 3
Level 3 Analysis - Supplemental Data [Abstract]
Assets fair value	17,107		17,107		$ 16,410
Realized/unrealized gains (losses), assets	1,300	(744)	1,000	374
Realized/unrealized gains (losses), liabilities	$ 928	$ (763)	$ 988	$ 845