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Reserve for Unpaid Losses and Loss Adjustment Expenses - Reconciliation of Loss Development to Liability for Unpaid Losses and Loss Adjustment Expenses, Group (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid losses and loss adjustment expenses | $ 32,287 | $ 28,317 |  |
Group Insurance Policies |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 16,350 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (10,488) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 3,796 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 181 |  |  |
Discount | (1,536) | (1,303) | $ (1,382) |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 8,303 | 5,564 | 5,671 | $ 5,804
Reinsurance and Other Recoverables | 209 | 208 | 218 | 209
Unpaid losses and loss adjustment expenses | 8,512 | $ 5,772 | $ 5,889 | $ 6,013
Group Insurance Policies | Group long-term disability |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 10,511 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (5,138) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 2,651 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 166 |  |  |
Discount | (1,383) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 6,807 |  |  |
Reinsurance and Other Recoverables | 207 |  |  |
Unpaid losses and loss adjustment expenses | 7,014 |  |  |
Group Insurance Policies | Group life and accident, excluding premium waiver |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 5,839 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (5,350) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 138 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 3 |  |  |
Discount | (21) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 609 |  |  |
Reinsurance and Other Recoverables | 1 |  |  |
Unpaid losses and loss adjustment expenses | 610 |  |  |
Group Insurance Policies | Group short-term disability |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 99 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 5 |  |  |
Discount | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 104 |  |  |
Reinsurance and Other Recoverables | 0 |  |  |
Unpaid losses and loss adjustment expenses | 104 |  |  |
Group Insurance Policies | Group life premium waiver |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 869 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 7 |  |  |
Discount | (132) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 744 |  |  |
Reinsurance and Other Recoverables | 1 |  |  |
Unpaid losses and loss adjustment expenses | 745 |  |  |
Group Insurance Policies | Group supplemental health |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 39 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |  |
Discount | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 39 |  |  |
Reinsurance and Other Recoverables | 0 |  |  |
Unpaid losses and loss adjustment expenses | $ 39 |  |  |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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