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Basis of Presentation - Adoption of New Accounting Standards (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jan. 01, 2019
New ASU |  |
Lease, Practical Expedients, Package | true |
Right-of-use assets | $ 378 |
Operating lease liability | $ 389 |
Lease, Practical Expedient, Land Easement [true false] | true |
Accounting Standards Update 2016-02 [Member] | Adjustment [Member] |  |
New ASU |  |
Right-of-use assets |  | $ 385
Operating lease liability |  | $ 385

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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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- Definition Indicates (true false) whether practical expedient is elected for not assessing existing and expired land easements under Topic 842. + 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 (gg) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 + Details
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