Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details)

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Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash used in operating activities $ 1,231 $ (404) $ (483)
Cash flows from investing activities      
Net cash provided by (used in) investing activities (3,381) (4,413) (6,984)
Cash flows from financing activities      
Debt issuance and deferred financing costs (89) (172) (513)
Distribution and dividends to non-controlling interest (185) (80) (80)
Proceeds from exercise of stock options 0 0 2
Payments related to tax withholdings for share-based compensation (12) (20) (61)
Other 0 0 2
Net cash provided by (used in) financing activities 2,936 4,908 6,423
Net increase (decrease) in cash, cash equivalents and restricted cash 786 91 (1,044)
Cash, cash equivalents and restricted cash—beginning of period 1,827 1,736 2,780
Cash, cash equivalents and restricted cash—end of period 2,613 1,827 1,736
Parent Company [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash used in operating activities (4) (102) (176)
Cash flows from investing activities      
Investments in affiliates 209 202 (181)
Net cash provided by (used in) investing activities 209 202 (181)
Cash flows from financing activities      
Proceeds from issuance of debt 0 0 500
Debt issuance and deferred financing costs (15) 0 (4)
Distribution and dividends to non-controlling interest (185) (80) (80)
Proceeds from exercise of stock options 0 0 2
Payments related to tax withholdings for share-based compensation (12) (20) (61)
Other 0 0 1
Net cash provided by (used in) financing activities (212) (100) 358
Net increase (decrease) in cash, cash equivalents and restricted cash (7) 0 1
Cash, cash equivalents and restricted cash—beginning of period 7 7 6
Cash, cash equivalents and restricted cash—end of period $ 0 $ 7 $ 7