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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 + References No definition available. + Details
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- Definition Financial Instruments Subject to Mandatory Redemption, Dividend Rate Spread On 5-year Treasury Rate + References No definition available. + Details
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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 + Details
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- Definition The cash outflow for reacquisition of callable preferred stock. + References 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 + Details
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