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Basis of Presentation - Credit loss adoption (Detail) - USD ($) $ in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  | $ 10,718 | $ 10,592 |  |
Adoption of new accounting standard | $ (2) | (2) |  |  |
Accounts receivable, net of allowance |  | 1,846 | 1,949 |  |
Allowance for doubtful accounts |  | $ 28 | $ 28 | $ 30 | $ 29
Receivables outstanding less than 60 days (as a percent) |  | 90.00% |  |  |
Threshold period to measure receivables |  | 60 days |  |  |
COVID 19 [Member] |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Allowance for doubtful accounts |  | $ 5 |  |  |
Accounting Standards Update 2016-13 [Member] | Adjustment [Member] |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Allowance for doubtful accounts | $ (1) | $ (1) |  |  |

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