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Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Interest expense | $ 160 | $ 147 | $ 462 | $ 434
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 1 | 2 | 6 | 7
Interest expense | $ 9 | $ 8 | $ 29 | $ 29

X
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