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Mandatorily Redeemable Preferred Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Financial instruments subject to mandatory redemption shares outstanding (in shares)	750,000		750,000
Percent threshold for mandatory redemption	30.00%
Mandatorily Redeemable Preferred Stock
Related Party Transaction [Line Items]
Financial instruments subject to mandatory redemption shares outstanding (in shares)	750,000
Increase (decrease) in restricted cash	$ 750
Dividend rate plus 5-year treasury rate	9.00%
Dividend rate plus 5-year treasury rate if dividend is not paid	9.75%
Mandatorily Redeemable Preferred Stock | Koch | Affiliated Entity
Related Party Transaction [Line Items]
Financial instruments subject to mandatory redemption, increase during period	$ 25
Payments of dividends		$ 21

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- Definition

Financial Instruments Subject to Mandatory Redemption, Dividend Rate Plus 5-year Treasury Rate if Dividend is not Paid

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Financial Instruments Subject to Mandatory Redemption, Dividend Rate Spread On 5-year Treasury Rate

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Financial Instruments Subject to Mandatory Redemption, Increase During Period

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Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Number of Shares Outstanding

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- Definition

The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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- Definition

The cash outflow for reacquisition of callable preferred stock.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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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.

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