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Acquisition (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 03, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 2,189 |  | $ 2,189 |  | $ 2,181
SquareTrade |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred | $ 1,400 |  |  |  |  |
Goodwill | 1,100 |  |  |  |  |
Commissions paid to retailers | 66 |  |  |  |  |
Intangible assets | 555 |  |  |  |  |
Prepaid contractual liability insurance policy premium expenses | 205 |  |  |  |  |
Unearned premiums | 389 |  |  |  |  |
Net deferred income tax liability | 138 |  |  |  |  |
Amortization of intangible assets |  | $ 20 | $ 23 | $ 41 | $ 46 |
Customer Relationships | SquareTrade |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired | 465 |  |  |  |  |
Trade Names | SquareTrade |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Indefinite-lived intangible assets acquired | $ 69 |  |  |  |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Commissions Paid to Retailers + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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