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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash Generated From Operations    
Net income $ 185 $ 157
Depreciation 64 63
Amortization of debt issue costs reported as interest expense (Note 3) 1 1
Equity allowance for funds used during construction   (1)
Change in operating working capital (Note 10) 8 9
Total cash generated from operations 256 229
Investing Activities    
Acquisition of the remaining 30 percent interest in GTN   (264)
Capital expenditures (21) (45)
Other 3 1
Total investing activities (165) (282)
Financing Activities    
Distributions paid to non-controlling interests   (9)
Common unit issuance, net 35 26
Common unit issuance subject to rescission, net (Note 7) 83  
Equity contribution by the General Partner   2
Long-term debt issued, net of discount (Note 5) 200 598
Long-term debt repaid (Note 5) (180) (390)
Debt issuance costs   (3)
Total financing activities (58) 55
Increase in cash and cash equivalents 33 2
Cash and cash equivalents, beginning of period 39 26
Cash and cash equivalents, end of period 72 28
Class B units    
Financing Activities    
Distributions paid (Note 7) (12)  
Common units and General Partner interest combined    
Financing Activities    
Distributions paid (Note 9) (184) (169)
Northern Border    
Investing Activities    
Cumulative distributions in excess of equity earnings 31 18
Great Lakes    
Investing Activities    
Cumulative distributions in excess of equity earnings 19 12
Investment in Great Lakes / Acquisition of49.9 percent interest in PNGTS (Note 6) (4) $ (4)
Portland Natural Gas Transmission System    
Cash Generated From Operations    
Equity earnings in excess of cumulative distributions (2)  
Investing Activities    
Investment in Great Lakes / Acquisition of49.9 percent interest in PNGTS (Note 6) $ (193)