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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net income $ 612,809 $ 1,278,577 $ 1,155,032
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 578,662 476,535 428,557
Impairment charges 644,930 0 0
Equity in net earnings from investments (143,241) (154,541) (158,383)
Distributions received from unconsolidated affiliates 144,352 163,476 170,528
Deferred income tax expense 186,730 372,729 361,010
Other, net 35,327 (26,101) 23,570
Changes in assets and liabilities:      
Accounts receivable (1,297) (19,688) 383,993
NGLs and natural gas in storage 77,116 (8,259) 38,456
Accounts payable (80,257) (62,946) (320,132)
Commodity imbalances 95,200 (1,934) (44,302)
Accrued interest 54,403 29,373 26,068
Risk-management assets and liabilities (187,458) (86,268) 117,717
Other assets and liabilities, net 118,208 14,174 4,605
Cash provided by operating activities 1,899,068 1,946,779 2,186,719
Investing activities      
Capital expenditures (less allowance for equity funds used during construction) (2,195,381) (3,848,349) (2,141,475)
Distributions received from unconsolidated affiliates in excess of cumulative earnings 31,808 94,168 26,757
Other, net (106,956) (14,577) (170)
Cash used in investing activities (2,270,529) (3,768,758) (2,114,888)
Financing activities      
Dividends paid (1,605,366) (1,457,628) (1,335,058)
Distributions to noncontrolling interests 0 0 (3,500)
Borrowing (repayment) of short-term borrowings, net (220,000) 220,000 (614,673)
Issuance of long-term debt, net of discounts 3,244,777 4,185,435 1,795,773
Debt financing costs (28,247) (29,747) (13,441)
Repayment of long-term debt (1,457,222) (1,057,348) (932,650)
Issuance of common stock 969,759 29,040 1,203,981
Acquisition of noncontrolling interests 0 0 (195,000)
Other, net (28,702) (58,790) (2,481)
Cash provided by (used in) financing activities 874,999 1,830,962 (97,049)
Change in cash and cash equivalents 503,538 8,983 (25,218)
Cash and cash equivalents at beginning of period 20,958 11,975 37,193
Cash and cash equivalents at end of period 524,496 20,958 11,975
Supplemental cash flow information:      
Cash paid for interest, net of amounts capitalized 760,984 435,165 418,244
Cash paid for income taxes, net of refunds $ 342 $ 2,690 $ 2,225