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Significant Accounting Policies - Future Minimum Commitments Under Our corporate Headquarters Lease and Other Non-Cancelable Operating Leases (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Schedule Of Accounting Policies [Line Items] |  |
2019 | $ (3) |
2020 | (2) |
2021 | (2) |
2022 | (2) |
Total | (9) |
2019 | 25 |
2020 | 25 |
2021 | 24 |
2022 | 24 |
2023 | 19 |
Thereafter | 76 |
Total | 193 |
Headquarters Lease |  |
Schedule Of Accounting Policies [Line Items] |  |
2019 | 9 | [1]
2020 | 9 | [1]
2021 | 10 | [1]
2022 | 10 | [1]
2023 | 10 | [1]
Thereafter | 67 | [1]
Total | 115 | [1]
Other Operating Leases |  |
Schedule Of Accounting Policies [Line Items] |  |
2019 | 19 |
2020 | 18 |
2021 | 16 |
2022 | 16 |
2023 | 9 |
Thereafter | 9 |
Total | $ 87 |
[1] | Amount includes an $83 million financing obligation in other long-term liabilities on our consolidated balance sheet at December 31, 2018, related to the Headquarters Lease.

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