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Summary of Significant Accounting Standards and Policies - ASU 2016-02 (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Sep. 30, 2019
--- | --- | ---
Recently Adopted Accounting Standards |  |
Lease, Practical expedients, Package | true |
Lease, Practical expedients, Use of hindsight | false |
Operating lease liabilities |  | $ 141
Operating lease assets |  | $ 132
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 |

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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 Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease. + 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 (f) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 + Details
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