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SCHEDULE IV - CONSOLIDATED REINSURANCE (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consolidated reinsurance, net [Abstract] |  |  |  |
Premiums Earned, Net, Total |  | $ 3,256 | $ 2,987 | $ 3,246
Embedded derivatives - Reinsurance related [Member] |  |  |  |
Consolidated reinsurance, net [Abstract] |  |  |  |
Gross Amount |  | 10,269 | 9,551 | 9,529
Ceded to Other Companies |  | 1,485 | 1,413 | 1,311
Assumed from Other Companies |  | 91 | 93 | 73
Premiums Earned, Net, Total |  | 8,875 | 8,231 | 8,291
Gross Amount, Life Insurance in Force | [1] | 1,075,600 | 1,035,600 | 1,032,900
Ceded to Other Companies, Life Insurance in Force | [1] | 286,600 | 288,000 | 287,400
Assumed from Other Companies, Life Insurance in Force | [1] | 9,500 | 10,200 | 10,400
Premiums, Net, Life Insurance in Force, Total | [1] | $ 798,500 | $ 757,800 | $ 755,900
Percentage of Amount Assumed to Net, Life Insurance in Force | [1] | 1.20% | 1.30% | 1.40%
Life insurance and annuities [Member] | Embedded derivatives - Reinsurance related [Member] |  |  |  |
Consolidated reinsurance, net [Abstract] |  |  |  |
Gross Amount | [2] | $ 8,949 | $ 8,277 | $ 8,112
Ceded to Other Companies | [2] | 1,465 | 1,392 | 1,289
Assumed from Other Companies | [2] | 80 | 80 | 58
Premiums Earned, Net, Total | [2] | $ 7,564 | $ 6,965 | $ 6,881
Percentage of Amount Assumed to Net | [2] | 1.10% | 1.10% | 0.80%
Accident and health insurance [Member] | Embedded derivatives - Reinsurance related [Member] |  |  |  |
Consolidated reinsurance, net [Abstract] |  |  |  |
Gross Amount |  | $ 1,320 | $ 1,274 | $ 1,417
Ceded to Other Companies |  | 20 | 21 | 22
Assumed from Other Companies |  | 11 | 13 | 15
Premiums Earned, Net, Total |  | $ 1,311 | $ 1,266 | $ 1,410
Percentage of Amount Assumed to Net |  | 0.80% | 1.00% | 1.10%
[1] | Includes Group Protection segment and Other Operations in-force amounts.
[2] | Includes insurance fees on universal life and other interest-sensitive products.

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- Definition Amount of life insurance issued and outstanding assumed from other entities. Includes, but not limited to, dividends and adjustments to face value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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