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Schedule I - CONDENSED STATEMENT OF CASH FLOWS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]        
Cash flows provided by/(used in) operating activities $ 308 $ (57) $ (821)  
Cash flows from investing activities        
Proceeds from long term receivable 0 (3) 69  
Cash flows provided by investing activities (121) (1,200) (900)  
Cash flows from financing activities        
Issuance of common stock, net of fees 0 0 136  
Proceeds from the issuance of long-term debt 120 310 4,436  
Repayments of long-term debt (268) (450) (2,833)  
Other financing 11 25 (30)  
Cash flows provided by/(used in) financing activities (1,533) (217) 1,521  
Net increase/(decrease) in cash, cash equivalents, and restricted cash 3,237 (1,493) (257)  
Cash, cash equivalents, and restricted cash, beginning of period 4,631 1,394 2,887 $ 3,144
Cash, cash equivalents, and restricted cash, end of period 4,631 1,394 2,887  
Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Cash flows provided by/(used in) operating activities (47) (287) 152  
Cash flows from investing activities        
Proceeds from long term receivable 0 40 0  
Cash flows provided by investing activities 0 40 0  
Cash flows from financing activities        
Issuance of common stock, net of fees 0 0 136  
Proceeds from the issuance of long-term debt 0 0 13  
Repayments of long-term debt 0 (68) 0  
Other financing (7) (2) 0  
Cash flows provided by/(used in) financing activities (7) (70) 149  
Net increase/(decrease) in cash, cash equivalents, and restricted cash (54) (317) 301  
Cash, cash equivalents, and restricted cash, beginning of period 94 148 465 $ 164
Cash, cash equivalents, and restricted cash, end of period $ 94 $ 148 $ 465