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Restructuring and Other Termination Costs (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | [1] | Jun. 30, 2019 | Jun. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other termination costs, number of positions eliminated, period percent | 13.00% |  |  |  |  |
Restructuring and other termination costs |  | $ 0 | $ 0 | $ 0 | $ 38 | [1]
One-time termination benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other termination costs |  |  |  |  | $ 38 |
[1] | Financial information for 2018 has been recast to reflect the retrospective application of the successful efforts method of accounting. See Note 1.

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