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Significant Accounting Policies - Additional Information Related to Leases (Parenthetical) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 | Dec. 31, 2019
Lessee Disclosure [Abstract] |  |  |
Operating leases | $ 88 | $ 106 | [1]
Operating leases commenced amount |  | $ 18 |
[1] | Amount includes operating leases existing on January 1, 2019 of $88 million and those that commenced during the year ended December 31, 2019 of $18 million.

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- Definition Right-of-use asset obtained in exchange for operating lease liability commenced since adoption of lease standard ASC 842. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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