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Investments - Investments - Commercial Mortgage Loans Credit Quality (Details) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 3,355,000,000 | $ 3,175,000,000
Commercial Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 3,355,000,000 | $ 3,175,000,000
Avg. Debt-Service Coverage Ratio | 2.68 | 2.69
Commercial Loan [Member] | Greater than 80% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 0 | $ 18,000,000
Avg. Debt-Service Coverage Ratio | 0.00 | 1.27
Commercial Loan [Member] | 65% - 80% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 361,000,000 | $ 265,000,000
Avg. Debt-Service Coverage Ratio | 1.63 | 1.95
Commercial Loan [Member] | Less than 65% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 2,994,000,000 | $ 2,892,000,000
Avg. Debt-Service Coverage Ratio | 2.76 | 2.76
Mortgage loans | Commercial Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans | $ 0 |

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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.10(a)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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