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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Cash Flows [Abstract]        
Cash and cash equivalents $ 71 $ 106 $ 54 $ 69
Restricted cash included in Other long-term assets 12 14 11 10
Total cash, cash equivalents and restricted cash at end of period [1] $ 83 $ 120 $ 65 $ 79
[1] The following table reconciles cash, cash equivalents and restricted cash per the statement of cash flows to the balance sheet. The restricted cash balances are primarily due to letters of credit which have been issued to the landlords of leased office space. The terms of the letters of credit primarily extend beyond one year.
(in millions)December 31, 2020December 31, 2019December 31, 2018December 31, 2017
Cash and cash equivalents$71 $106 $54 $69 
Restricted cash included in Other long-term assets12 14 11 10 
Total cash, cash equivalents and restricted cash at end of period$83 $120 $65 $79