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Business Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Jul. 29, 2016 | Dec. 31, 2017 | Nov. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Liabilities |  |  |  |  |
Goodwill |  | $ 1,290 |  | $ 567 | $ 498
Minimum |  |  |  |  |
Liabilities |  |  |  |  |
Estimated Useful Life | 5 years |  |  |  |
Maximum |  |  |  |  |
Liabilities |  |  |  |  |
Estimated Useful Life | 8 years |  |  |  |
Aetna Group Insurance |  |  |  |  |
Assets |  |  |  |  |
Cash and invested assets |  |  | $ 3,360 |  |
Premiums receivable |  |  | 96 |  |
Deferred income taxes, net |  |  | 56 |  |
Other intangible assets |  |  | 629 |  |
Property and equipment |  |  | 68 |  |
Other assets |  |  | 16 |  |
Total Assets Acquired |  |  | 4,225 |  |
Liabilities |  |  |  |  |
Unpaid losses and loss adjustment expenses |  |  | 2,833 |  |
Reserve for future policy benefits |  |  | 346 |  |
Other policyholder funds and benefits payable |  |  | 245 |  |
Unearned premiums |  |  | 3 |  |
Other liabilities |  |  | 69 |  |
Total Liabilities Assumed |  |  | 3,496 |  |
Net identifiable assets acquired |  |  | 729 |  |
Goodwill |  |  | 723 |  |
Net Assets Acquired |  |  | 1,452 |  |
Goodwill, expected tax deductible |  |  | $ 623 |  |
Maxum |  |  |  |  |
Assets |  |  |  |  |
Cash and invested assets | $ 274 |  |  |  |
Reinsurance recoverables | 113 |  |  |  |
Cash | 12 |  |  |  |
Other intangible assets | 7 |  |  |  |
Intangible assets | 11 |  |  |  |
Other assets | 79 |  |  |  |
Total Assets Acquired | 477 |  |  |  |
Liabilities |  |  |  |  |
Unpaid losses | 235 |  |  |  |
Unearned premiums | 77 |  |  |  |
Other liabilities | 34 |  |  |  |
Total Liabilities Assumed | 346 |  |  |  |
Net identifiable assets acquired | 131 |  |  |  |
Goodwill | 38 |  |  |  |
Net Assets Acquired | 169 |  |  |  |
Indefinite lived intangible assets | $ 4 |  |  |  |
Estimated Useful Life | 10 years |  |  |  |
Lattice |  |  |  |  |
Assets |  |  |  |  |
Cash | $ 1 |  |  |  |
Other intangible assets | 1 |  |  |  |
Intangible assets | 11 |  |  |  |
Total Assets Acquired | 12 |  |  |  |
Liabilities |  |  |  |  |
Total Liabilities Assumed | 1 |  |  |  |
Net identifiable assets acquired | 11 |  |  |  |
Goodwill | 31 |  |  |  |
Net Assets Acquired | 42 |  |  |  |
Indefinite lived intangible assets | $ 10 |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31917-109318 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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