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Variable Interest Entities (VIEs) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2011
Variable Interest Entity [Line Items] |  |  |  |  |
Administrative fee revenue |  | $ 50 | $ 55 | $ 69 |
New Mexico Data Center |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Tax credit claimed as a percentage of original investment amount |  |  |  |  | 39.00%
Tax credit claimed, term |  |  |  |  | 7 years
Percentage of credit claimed for first three years |  |  |  |  | 5.00%
Percentage of credit claimed for remaining four years |  |  |  |  | 6.00%
Capital contribution by related party |  |  |  |  | $ 6
Principal amount of loan by party |  |  |  |  | 16
Proceeds from other debt |  |  | 6 |  | $ 21
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Amount paid for health care services |  | 119 | 122 | $ 117 |
Variable interest entity, total assets |  | 8 | 18 |  |
Variable interest entity, total liabilities |  | $ 8 | $ 18 |  |
Variable Interest Entity, Primary Beneficiary | Subsequent Event |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Payments for purchase of assets | $ 2 |  |  |  |

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- Definition Percentage of credit claimed for each of remaining four years. + References No definition available. + Details
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- Definition Percentage of credit claimed for first three years. + References No definition available. + Details
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- Definition Amount of revenue from providing administrative services, including, but not limited to, accounting, tax, legal, regulatory filing, and share registration activities of managed funds and investment accounts of independent third parties and related and affiliated entities. + References No definition available. + Details
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- Definition Amount of cash paid to purchase other assets as part of operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3367-108585 + Details
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- Definition The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685 + Details
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- Definition The amount of financial or other support the reporting entity has provided (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted the VIE in obtaining another type of support. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685 + Details
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