v3.8.0.1

Employee Benefit Plans (Changes in Fair Value of Level 3 Pension and Post Retirement Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Pooled Separate Accounts | Fixed Maturities | Pension Benefits |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair Value, beginning of period | $ 36 | $ 35
Actual Return on Assets: |  |
Relating to assets still held at the reporting date | 2 | 1
Relating to assets sold during the period | 0 | 0
Purchases, sales and settlements | 0 | 0
Transfers in and/or out of Level 3 | 0 | 0
Fair Value, end of period | 38 | 36
Pooled Separate Accounts | Real Estate | Pension Benefits |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair Value, beginning of period | 666 | 607
Actual Return on Assets: |  |
Relating to assets still held at the reporting date | 50 | 61
Relating to assets sold during the period | 6 | 6
Purchases, sales and settlements | (8) | (8)
Transfers in and/or out of Level 3 | 0 | 0
Fair Value, end of period | 714 | 666
Corporate Debt | Fixed Maturities | Pension Benefits |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair Value, beginning of period | 0 |
Actual Return on Assets: |  |
Relating to assets still held at the reporting date | 0 |
Relating to assets sold during the period | 0 |
Purchases, sales and settlements | 0 |
Transfers in and/or out of Level 3 | 1 |
Fair Value, end of period | 1 | 0
Corporate Debt | Asset-backed | Fixed Maturities | Other Postretirement Benefits |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair Value, beginning of period | 1 | 0
Actual Return on Assets: |  |
Relating to assets still held at the reporting date | 0 | 0
Relating to assets sold during the period | 0 | 0
Purchases, sales and settlements | 0 | 1
Transfers in and/or out of Level 3 | (1) | 0
Fair Value, end of period | 0 | 1
Collateralized Mortgage Obligations | Corporate Debt | Fixed Maturities | Other Postretirement Benefits |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair Value, beginning of period | 5 | 0
Actual Return on Assets: |  |
Relating to assets still held at the reporting date | 0 | 0
Relating to assets sold during the period | 0 | 0
Purchases, sales and settlements | (3) | 5
Transfers in and/or out of Level 3 | 0 | 0
Fair Value, end of period | 2 | 5
Collateralized loan obligations | Corporate Debt | Fixed Maturities | Other Postretirement Benefits |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair Value, beginning of period | 0 |
Actual Return on Assets: |  |
Relating to assets still held at the reporting date | 0 |
Relating to assets sold during the period | 0 |
Purchases, sales and settlements | 2 |
Transfers in and/or out of Level 3 | 0 |
Fair Value, end of period | 2 | 0
Other | Fixed Maturities | Pension Benefits |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair Value, beginning of period | 49 | 93
Actual Return on Assets: |  |
Relating to assets still held at the reporting date | 0 | 0
Relating to assets sold during the period | 0 | 0
Purchases, sales and settlements | (10) | (44)
Transfers in and/or out of Level 3 | 0 | 0
Fair Value, end of period | 39 | 49
Other | Fixed Maturities | Other Postretirement Benefits |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair Value, beginning of period | 5 | 3
Actual Return on Assets: |  |
Relating to assets still held at the reporting date | 0 | 0
Relating to assets sold during the period | 0 | 0
Purchases, sales and settlements | 0 | 2
Transfers in and/or out of Level 3 | 0 | 0
Fair Value, end of period | $ 5 | $ 5

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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