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Significant Accounting Policies - Additional Information Related to Leases (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 | Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |
Operating cash outflows from operating leases |  |  | $ 26 |
Operating cash outflows from finance lease |  |  | 4 |
Financing cash outflows from finance lease |  |  | 5 |
Right-of-use assets obtained in exchange for lease liabilities: |  |  |  |
Operating leases |  | $ 88 | 106 | [1]
Finance lease | [2] |  | $ 88 |
Weighted-average remaining lease term: |  |  |  |
Operating leases |  |  | 4 years 4 months 24 days |
Finance lease |  |  | 11 years |
Weighted-average discount rate: |  |  |  |
Operating leases |  |  | 4.11% |
Finance lease |  |  | 4.49% |
[1] | Amount includes operating leases existing on January 1, 2019 of $88 million and those that commenced during the year ended December 31, 2019 of $18 million.
[2] | Amount represents the finance lease liability arising from obtaining the ROU asset related to our Headquarters Lease, which was recognized upon the adoption of ASC 842 on January 1, 2019.

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