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Reserves for Unpaid Losses and Loss Adjustment Expenses Level 4 Reconciliation of Loss Development to Liability for Unpaid Losses and Loss Adjustment Expenses, Group (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | $ 298 | $ 550 |  |
Liability for Claims and Claims Adjustment Expense | 27,605 | 27,713 |  |
Group Insurance Policies [Member] |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 14,369 |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | (9,391) |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 1,750 |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense | 139 |  |  |
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount | (1,303) | (1,382) | $ (1,502) |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 5,564 | 5,671 | 5,804 | $ 6,048
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 208 | 218 | 209 | 210
Liability for Claims and Claims Adjustment Expense | 5,772 | $ 5,889 | $ 6,013 | $ 6,258
Group Insurance Policies [Member] | Long-term Disability [Member] |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 11,293 |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | (6,570) |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 1,021 |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense | 128 |  |  |
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount | (1,185) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 4,687 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 206 |  |  |
Liability for Claims and Claims Adjustment Expense | 4,893 |  |  |
Group Insurance Policies [Member] | Accident and Health Insurance Product Line [Member] |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 3,076 |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | (2,821) |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 80 |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense | 2 |  |  |
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount | (18) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 319 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 0 |  |  |
Liability for Claims and Claims Adjustment Expense | 319 |  |  |
Group Insurance Policies [Member] | Short-term Disability [Member] |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 52 |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense | 2 |  |  |
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount | 0 |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 54 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 0 |  |  |
Liability for Claims and Claims Adjustment Expense | 54 |  |  |
Group Insurance Policies [Member] | Premium Waiver Rider [Member] |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 558 |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense | 7 |  |  |
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount | (100) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 465 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 2 |  |  |
Liability for Claims and Claims Adjustment Expense | 467 |  |  |
Group Insurance Policies [Member] | Supplemental Health [Member] |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 39 |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense | 0 |  |  |
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount | 0 |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 39 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 0 |  |  |
Liability for Claims and Claims Adjustment Expense | $ 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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