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Summary of Significant Accounting Standards and Policies - ASU 2016-02 (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Dec. 31, 2019
--- | --- | ---
Recently Adopted Accounting Standards |  |
Lease, Practical expedients, Package | true |
Lease, Practical expedients, Use of hindsight | false |
Operating lease liabilities |  | $ 161
Operating lease assets |  | $ 151
Operating Lease, Liability, Statement of Financial Position | us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent | us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent
ASU 2016-02, Leases |  |
Recently Adopted Accounting Standards |  |
Change in Accounting Principle, Accounting Standards Update, Adopted | true |
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected | Modified Retrospective |
ASU 2016-02, Leases | Adjustment |  |
Recently Adopted Accounting Standards |  |
Operating lease liabilities | $ 170 |
Operating lease assets | $ 161 |
ASU 2018-16 |  |
Recently Adopted Accounting Standards |  |
Change in Accounting Principle, Accounting Standards Update, Adopted | true |
ASU 2017-12 |  |
Recently Adopted Accounting Standards |  |
Change in Accounting Principle, Accounting Standards Update, Adopted | true |

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- Definition Indicates (true false) whether practical expedient is elected to use hindsight in determining lease term and in assessing impairment of right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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