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Investments (Fair Value of Trading Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	$ 4,501	$ 4,673
Corporate Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	3,107	2,947
U.S. Government Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities		45
Foreign Government Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	92	44
RMBS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	132	170
CMBS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	134	163
ABS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	966	1,238
State And Municipal Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	28	17
Hybrid And Redeemable Preferred Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	$ 42	$ 49

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

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