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Basis of Presentation (Detail) - USD ($) $ in Millions | Jan. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
New ASU |  |  |  |  |
Restricted trust and escrow accounts |  | $ 422 | $ 319 |  |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |
New ASU |  |  |  |  |
Equity investments without readily determinable fair values |  | $ 87 |  |  |
Accounting Standards Update 2016-15 [Member] |  |  |  |  |
New ASU |  |  |  |  |
Restricted trust and escrow accounts |  |  | $ 271 | $ 64 | $ 62
Accounting Standards Update 2018-02 [Member] |  |  |  |  |
New ASU |  |  |  |  |
Adoption of new accounting standard | $ (5) |  |  |  |

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