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Employee Benefit Plans - Obligations and Funded Status, Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets had fair value of rabbi trusts been included |  | $ 3,736 | $ 4,811 |
Funded status of plan had fair value of rabbi trust assets been included |  | (640) | (840) |
Separate Account Assets |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 3,700 | 4,800 |
Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Changes in assumptions, discount rate |  | $ 350 | $ 21 |
Discount rate |  | 3.73% | 4.22% |
Changes in assumptions, mortality tables |  |  | $ 51 |
Assets held in rabbi trusts and designated for the non-qualified pension plans |  | $ 144 | 132 |
Fair value of plan assets |  | 3,592 | 4,678 | $ 4,430
Transferred pension obligation | $ 1,600 | 1,647 | $ 0 |
After-tax settlement charge | $ 750 | $ 488 |  |

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- Definition Assets held in rabbi trusts and designated for non qualified pension plans. + References No definition available. + Details
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- Definition Defined Benefit Plan, Changes in Assumptions, Discount Rate + References No definition available. + Details
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- Definition Defined Benefit Plan, Changes in Assumptions, Mortality Tables + References No definition available. + Details
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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlements, Net of Tax + References No definition available. + Details
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- Definition Fair value of pension plan assets under rabbi trust. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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