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Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 54,995
Remaining Life - 1 - 5 Years	77,548
Remaining Life - 6 - 10 Years	36,110
Remaining Life - 11 - 30 Years	38,664
Remaining Life Over - 30 Years	9,509
Remaining Life - Total Years	216,826	$ 163,315
Interest Rate Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	14,052
Remaining Life - 1 - 5 Years	57,331
Remaining Life - 6 - 10 Years	29,217
Remaining Life - 11 - 30 Years	36,959
Remaining Life Over - 30 Years	1,213
Remaining Life - Total Years	$ 138,772
Derivative maturity date	Apr. 20, 2067
Foreign currency contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 227
Remaining Life - 1 - 5 Years	411
Remaining Life - 6 - 10 Years	1,062
Remaining Life - 11 - 30 Years	1,693
Remaining Life Over - 30 Years
Remaining Life - Total Years	$ 3,393
Derivative maturity date	Jun. 17, 2050
Equity market contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 40,716
Remaining Life - 1 - 5 Years	19,755
Remaining Life - 6 - 10 Years	5,831
Remaining Life - 11 - 30 Years	12
Remaining Life Over - 30 Years	8,296
Remaining Life - Total Years	74,610
Credit contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life - 1 - 5 Years	51
Remaining Life - Total Years	$ 51

X

- Definition

Total notional amounts of derivative financial instruments maturing in 11 - 30 years.

+ References

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- Definition

Total notional amounts of derivative financial instruments maturing in 1 - 5 years.

+ References

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- Definition

Total notional amounts of derivative financial instruments maturing in 6 - 10 years.

+ References

No definition available.

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- Definition

Total notional amounts of derivative financial instruments maturing in less than 1 year.

+ References

No definition available.

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- Definition

Total notional amounts of derivative financial instruments with maturity dates over 30 years

+ References

No definition available.

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- References

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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