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Basis of Presentation - Credit loss (Detail) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jan. 01, 2020 | Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Accounts receivable, net of allowance | $ 1,888 |  |  | $ 1,949
Total allowance increase (decrease) | $ 18 |  |  |
Receivables outstanding less than 60 days (as a percent) | 85.00% |  |  |
Threshold period to measure receivables | 60 days |  |  |
Allowance activity |  |  |  |
Allowance for doubtful accounts, beginning balance | $ 28 | $ 29 |  |
Additions charged to expense | 36 | 19 |  |
Accounts written-off, net of recoveries | (16) | (23) |  |
Acquisitions, divestitures and other, net | (1) | 3 |  |
Allowance for doubtful accounts, ending balance | 46 | $ 28 |  |
Notes and other receivables, current and noncurrent | 386 |  |  |
Allowance for notes and other receivables, current and noncurrent | $ 4 |  |  |
Receivables classified as current (as a percent) | 55.00% |  |  |
Accounting Standards Update 2016-13 [Member] | Adjustment [Member] |  |  |  |
Allowance activity |  |  |  |
Allowance for doubtful accounts, ending balance | $ (1) |  |  |
Allowance for notes and other receivables, current and noncurrent |  |  | $ 4 |

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