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New Accounting Standards and Reclassifications (Detail) - USD ($) $ in Millions | Jan. 01, 2019 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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New ASU |  |  |  |
Lease, Practical Expedients, Package [true/false] | true |  |  |
Lease, Practical Expedient, Land Easement [true false] | true |  |  |
Retained earnings |  | $ 11,159 |  | $ 10,592
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
New ASU |  |  |  |
Retained earnings |  |  | $ (2) |

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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=121329987&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=121329987&loc=SL77916155-209984 + Details
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