Condensed Consolidating Guarantor Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net cash provided by (used in) operating activities	$ 145	$ (159)	$ 356
Investing Activities
Capital expenditures for property and equipment	(37)	(44)	(35)
Software capitalization costs	(26)	(19)	(12)
Return of investment from unconsolidated affiliates		11
Investments in unconsolidated affiliates	(2)	(10)	(40)
Net cash used in investing activities	(65)	(62)	(87)
Financing Activities
Issuance of debt	485	530
Issuance of non-recourse debt	365	663	350
Repayment of debt	(290)	(408)	(10)
Repayment of non-recourse debt	(376)	(485)	(459)
Debt issuance costs	(6)	(12)	(5)
Proceeds from stock option exercises			1
Repurchase and retirement of common stock	(283)	(183)
Payment of withholding taxes on vesting of restricted stock units	(4)	(4)
Proceeds from employee stock plan purchases	3
Other financing activity	(2)
Capital contribution		3
Net cash (used in) provided by financing activities	(108)	104	(123)
Net (decrease) increase in cash, cash equivalents and restricted cash	(28)	(117)	146
Cash, cash equivalents and restricted cash, beginning of period	180	297	151
Cash, cash equivalents and restricted cash, end of period	152	180	297
Eliminations
Operating Activities
Net cash provided by (used in) operating activities	(815)	(3)	(8)
Investing Activities
Dividends from subsidiary	(562)
Net cash used in investing activities	(562)
Financing Activities
Intercompany transfers	1,377	3	8
Net cash (used in) provided by financing activities	1,377	3	8
Parent
Operating Activities
Net cash provided by (used in) operating activities	216
Investing Activities
Dividends from subsidiary	281
Net cash used in investing activities	281
Financing Activities
Repurchase and retirement of common stock	(283)
Payment of withholding taxes on vesting of restricted stock units	(4)
Proceeds from employee stock plan purchases	3
Intercompany transfers	(215)	4
Net cash (used in) provided by financing activities	(499)	4
Net (decrease) increase in cash, cash equivalents and restricted cash	(2)	4
Cash, cash equivalents and restricted cash, beginning of period	4
Cash, cash equivalents and restricted cash, end of period	2	4
Issuers
Operating Activities
Net cash provided by (used in) operating activities	498	(28)	(27)
Investing Activities
Dividends from subsidiary	281
Net cash used in investing activities	281
Financing Activities
Issuance of debt	485	530
Repayment of debt	(290)	(408)	(10)
Debt issuance costs		(7)
Repurchase and retirement of common stock		(183)
Payment of withholding taxes on vesting of restricted stock units		(4)
Capital contribution		3
Intercompany transfers	(974)	97	37
Net cash (used in) provided by financing activities	(779)	28	27
Guarantors
Operating Activities
Net cash provided by (used in) operating activities	(7)	163	156
Investing Activities
Capital expenditures for property and equipment	(33)	(37)	(33)
Software capitalization costs	(26)	(19)	(12)
Return of investment from unconsolidated affiliates		11
Investments in unconsolidated affiliates	(2)	(10)	(40)
Net cash used in investing activities	(61)	(55)	(85)
Financing Activities
Proceeds from stock option exercises			1
Other financing activity	(2)
Intercompany transfers	28	(233)	59
Net cash (used in) provided by financing activities	26	(233)	60
Net (decrease) increase in cash, cash equivalents and restricted cash	(42)	(125)	131
Cash, cash equivalents and restricted cash, beginning of period	134	259	128
Cash, cash equivalents and restricted cash, end of period	92	134	259
Non-Guarantors
Operating Activities
Net cash provided by (used in) operating activities	253	(291)	235
Investing Activities
Capital expenditures for property and equipment	(4)	(7)	(2)
Net cash used in investing activities	(4)	(7)	(2)
Financing Activities
Issuance of non-recourse debt	365	663	350
Repayment of non-recourse debt	(376)	(485)	(459)
Debt issuance costs	(6)	(5)	(5)
Intercompany transfers	(216)	129	(104)
Net cash (used in) provided by financing activities	(233)	302	(218)
Net (decrease) increase in cash, cash equivalents and restricted cash	16	4	15
Cash, cash equivalents and restricted cash, beginning of period	42	38	23
Cash, cash equivalents and restricted cash, end of period	$ 58	$ 42	$ 38

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