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Securities (Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Securities Available For Sale and Held to Maturity) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Unrealized Loss And Fair Value On Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 9,956	$ 1,733
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(144)	(10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	69	101
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	10,025	1,834
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(144)	(10)
Federal Agency Securities [Member]
Unrealized Loss And Fair Value On Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	64
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	33
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	97
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1)
Residential Agency [Member]
Unrealized Loss And Fair Value On Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	8,017	914
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(111)	(4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	17	101
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	8,034	1,015
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(111)	(4)
Commercial Agency [Member]
Unrealized Loss And Fair Value On Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,564	819
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(31)	(6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	19	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	1,583	819
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(31)	$ (6)
Corporate and other debt securities [Member]
Unrealized Loss And Fair Value On Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	311
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	311
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1)

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- Definition

Unrealized Loss And Fair Value Available For Sale Securities [Line Items]

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563

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