Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Cash Flows (Parenthetical)

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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]        
Cash and cash equivalents $ 106 $ 54 $ 69 $ 214
Restricted cash included in Other long-term assets 14 11 10 10
Cash, cash equivalents and restricted cash at end of period $ 120 [1] $ 65 [1] $ 79 [1] $ 224
[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.Cash and cash equivalents : December 31, 2019: $106, December 31, 2018: $54, December 31, 2017: $69, December 31, 2016: $214 Restricted cash included in Other long-term assets: December 31, 2019: $14, December 31, 2018: $11, December 31, 2017: $10, December 31, 2016: $10 Total cash, cash equivalents and restricted cash at end of period: December 31, 2019: $120, December 31, 2018: $65, , December 31, 2017: $79, December 31, 2016: $224