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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Activities        
Net income $ 219 $ 135 $ 546 $ 181
Adjusted for the following items:        
Earnings from investments in associates and joint ventures, net of distributions received 15 (16) 24 (21)
Depreciation and amortization expense 188 206 381 326
Mark-to-market on hedging items, provisions and other (40) 54 29 75
Gain (Loss) on Disposition of Business 0 0 (338) 0
Deferred income tax expense (recovery) 26 18 41 18
Changes in non-cash working capital, net (225) 22 (34) 18
Cash from operating activities 183 419 649 597
Investing Activities        
Acquisition of subsidiaries, net of cash acquired (398) (4,203) (398) (4,203)
Additions of investments in associates and joint ventures (40) (269) (55) (318)
Proceeds from sales of investments accounted for using equity method 0 0 1,289 0
Purchase of long lived assets (180) (176) (358) (351)
Disposal of long lived assets 2 0 5 41
Purchase of financial assets (77) (76) (140) (219)
Sale of financial assets and other 14 148 52 195
Net settlement of foreign exchange hedging items (18) (10) (72) (40)
Cash used by investing activities (697) (4,586) 323 (4,895)
Financing Activities        
Distributions to general partner (35) (28) (70) (56)
Distributions to other unitholders (194) (168) (387) (334)
Subsidiary distributions to non-controlling interest (158) (188) (333) (202)
Capital provided by non-controlling interest 146 2,817 146 2,817
Capital provided to non-controlling interest (877) 0 (877) 0
Proceeds from corporate borrowings 0 309 0 537
Proceeds from corporate credit facility 62 792 669 1,253
Repayment of corporate credit facility (62) (473) (1,458) (479)
Proceeds from subsidiary borrowings 1,816 325 2,684 341
Repayment of subsidiary borrowings (262) (75) (1,070) (132)
Preferred units issued 0 0 157 220
Partnership units issued, net of issuance costs 4 5 8 11
Cash from financing activities 440 3,316 (531) 3,976
Cash and cash equivalents        
Change during the year (74) (851) 441 (322)
Impact of foreign exchange on cash (34) (4) (33) 4
Balance, beginning of year 890 1,323 374 786
Balance, end of year $ 782 $ 468 $ 782 $ 468