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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities $ 1,990 $ 1,231 $ (404)
Cash flows from investing activities      
Net cash provided by (used in) investing activities (3,654) (3,381) (4,413)
Cash flows from financing activities      
Debt issuance and deferred financing costs (66) (89) (172)
Distribution and dividends to non-controlling interest (576) (185) (80)
Payments related to tax withholdings for share-based compensation (20) (12) (20)
Other (8) 0 0
Net cash provided by (used in) financing activities 2,207 2,936 4,908
Net increase (decrease) in cash, cash equivalents and restricted cash 543 786 91
Cash, cash equivalents and restricted cash—beginning of period 2,613 1,827 1,736
Cash, cash equivalents and restricted cash—end of period 3,156 2,613 1,827
Parent Company [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 48 (4) (102)
Cash flows from investing activities      
Investments in affiliates 568 209 202
Net cash provided by (used in) investing activities 568 209 202
Cash flows from financing activities      
Debt issuance and deferred financing costs (13) (15) 0
Distribution and dividends to non-controlling interest (576) (185) (80)
Payments related to tax withholdings for share-based compensation (20) (12) (20)
Other (7) 0 0
Net cash provided by (used in) financing activities (616) (212) (100)
Net increase (decrease) in cash, cash equivalents and restricted cash 0 (7) 0
Cash, cash equivalents and restricted cash—beginning of period 0 7 7
Cash, cash equivalents and restricted cash—end of period $ 0 $ 0 $ 7