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Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Investments	$ 9,151	$ 8,913
Other Segments and Holding Company
Schedule of Investments [Line Items]
Investments	199	674
Portion of unrealized (losses) gains that relates to equity securities still held	61	36	$ 421
Equity method investments | Other Segments and Holding Company
Schedule of Investments [Line Items]
Investments	79	120
Held-to-maturity Securities [Member] | Other Segments and Holding Company
Schedule of Investments [Line Items]
Investments		20
Other investments | Other Segments and Holding Company
Schedule of Investments [Line Items]
Investments	$ 120	$ 534

X

- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 944
-SubTopic 210
-Section S99
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