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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	$ 64	$ 108
Loans held for sale	8	0
Accrued income and other assets	72	56
Total assets at fair value	144	164
Level 1
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	0	0
Loans held for sale	0	0
Accrued income and other assets	0	0
Total assets at fair value	0	0
Level 2
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	0
Loans held for sale	0
Accrued income and other assets	0
Total assets at fair value	0	0
Level 3
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	64	108
Loans held for sale	8	0
Accrued income and other assets	72	56
Total assets at fair value	$ 144	$ 164

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+ References

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

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- Definition

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