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Schedule II (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 74 | $ 68 | $ 98 | $ 119
Net (credits) charges to expenses | 23 | 19 | 14 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | (17) | (19) | (18) |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment | $ 0 | $ (30) | $ (17) |

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