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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.