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New Accounting Standards and Reclassifications (Detail) - USD ($) $ in Millions | Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
New ASU |  |  |  |  |
Restricted trust and escrow accounts |  | $ 296 | $ 249 |  |
Accounting Standards Update 2016-18 [Member] |  |  |  |  |
New ASU |  |  |  |  |
Restricted cash and cash equivalents |  |  | $ 271 |  |
Restricted trust and escrow accounts |  |  |  | $ 62 | $ 65
Accounting Standards Update 2018-02 [Member] |  |  |  |  |
New ASU |  |  |  |  |
Adoption of new accounting standard | $ 5 |  |  |  |
Accounting Standards Update 2016-02 [Member] | Scenario Forecast Adjustment [Member] | Minimum [Member] |  |  |  |  |
New ASU |  |  |  |  |
Right-of-use assets |  | 300 |  |  |
Operating lease, liability |  | 300 |  |  |
Accounting Standards Update 2016-02 [Member] | Scenario Forecast Adjustment [Member] | Maximum [Member] |  |  |  |  |
New ASU |  |  |  |  |
Right-of-use assets |  | 350 |  |  |
Operating lease, liability |  | $ 350 |  |  |

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