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Investments - Valuation changes included in net income for investments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Investment [Line Items]
Total valuation changes	$ 309	$ 502
Equity securities
Investment [Line Items]
Total valuation changes	234	321
Limited partnership interests
Investment [Line Items]
Total valuation changes	$ 75	$ 181

X

- Definition

Realized Gain (Loss), Fair Value Recognized In Net Income

+ References

No definition available.

+ Details

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- Definition

Line items represent reporting 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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- Details

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