Condensed Consolidating Guarantor Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net cash provided by (used in) operating activities	$ 14
Net cash provided by (used in) operating activities	14	$ 25
Investing Activities
Capital expenditures for property and equipment	(6)	(14)
Software capitalization costs	(4)	(4)
Net cash used in investing activities	(10)	(14)
Return on investment from unconsolidated affiliates		9
Investment in unconsolidated affiliates		(5)
Financing Activities
Issuance of debt	195
Repayment of debt	(23)	(3)
Repayment of non-recourse debt	(40)	(39)
Repurchase and retirement of common stock	(92)	(112)
Payment of withholding taxes on vesting of restricted stock units	(2)	(1)
Net cash provided by (used in) financing activities	38	(154)
Debt issuance costs		(2)
Capital contribution		3
Net increase in cash, cash equivalents and restricted cash	42
Cash, cash equivalents and restricted cash, beginning of period	180	297
Cash, cash equivalents and restricted cash, end of period	222	154
Net cash provided by (used in) financing activities		(154)
Net increase (decrease) in cash, cash equivalents and restricted cash	42	(143)
Eliminations
Operating Activities
Net cash provided by (used in) operating activities	(190)
Net cash provided by (used in) operating activities		(3)
Investing Activities
Dividends from subsidiary	(200)
Net cash used in investing activities	(200)
Financing Activities
Intercompany transfers	390	3
Net cash provided by (used in) financing activities	390
Net cash provided by (used in) financing activities		3
Parent
Investing Activities
Dividends from subsidiary	100
Net cash used in investing activities	100
Financing Activities
Intercompany transfers	(91)
Net cash provided by (used in) financing activities	(91)
Net increase in cash, cash equivalents and restricted cash	9
Cash, cash equivalents and restricted cash, beginning of period	4
Cash, cash equivalents and restricted cash, end of period	13
Issuers
Operating Activities
Net cash provided by (used in) operating activities	140
Net cash provided by (used in) operating activities		(8)
Investing Activities
Dividends from subsidiary	100
Net cash used in investing activities	100
Financing Activities
Issuance of debt	195
Repayment of debt	(23)	(3)
Repurchase and retirement of common stock	(92)	(112)
Payment of withholding taxes on vesting of restricted stock units	(2)	(1)
Intercompany transfers	(318)	121
Net cash provided by (used in) financing activities	(240)
Capital contribution		3
Net cash provided by (used in) financing activities		8
Guarantors
Operating Activities
Net cash provided by (used in) operating activities	(2)
Net cash provided by (used in) operating activities		103
Investing Activities
Capital expenditures for property and equipment	(5)	(12)
Software capitalization costs	(4)	(4)
Net cash used in investing activities	(9)	(12)
Return on investment from unconsolidated affiliates		9
Investment in unconsolidated affiliates		(5)
Financing Activities
Intercompany transfers	37	(231)
Net cash provided by (used in) financing activities	37
Net increase in cash, cash equivalents and restricted cash	26
Cash, cash equivalents and restricted cash, beginning of period	134	259
Cash, cash equivalents and restricted cash, end of period	160	119
Net cash provided by (used in) financing activities		(231)
Net increase (decrease) in cash, cash equivalents and restricted cash		(140)
Non-Guarantors
Operating Activities
Net cash provided by (used in) operating activities	66
Net cash provided by (used in) operating activities		(67)
Investing Activities
Capital expenditures for property and equipment	(1)	(2)
Net cash used in investing activities	(1)	(2)
Financing Activities
Repayment of non-recourse debt	(40)	(39)
Intercompany transfers	(18)	107
Net cash provided by (used in) financing activities	(58)
Debt issuance costs		(2)
Net increase in cash, cash equivalents and restricted cash	7
Cash, cash equivalents and restricted cash, beginning of period	42	38
Cash, cash equivalents and restricted cash, end of period	$ 49	35
Net cash provided by (used in) financing activities		66
Net increase (decrease) in cash, cash equivalents and restricted cash		$ (3)

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