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Investments Other Segments and Holding Company (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule of Investments [Line Items]
Investments	$ 9,437		$ 9,437		$ 8,337
Other Segments and Holding Company
Schedule of Investments [Line Items]
Unrealized gains (losses) that relate to equity securities still held	42	$ 36	(438)	$ 91
Investments	719		719		1,470
Other Segments and Holding Company | Equity method investments
Schedule of Investments [Line Items]
Investments	199		199		143
Other Segments and Holding Company | Other investments (measured at fair value)
Schedule of Investments [Line Items]
Investments	$ 520		$ 520		$ 1,327

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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=116654751&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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
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