CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income	$ 921	$ 467
Adjustments to reconcile consolidated net income to net cash flows from operating activities:
Depreciation and amortization	2,441	2,497
Stock compensation expense	134	90
Noncash interest income, net	(7)	(12)
Deferred income taxes	156	(14)
Other, net	(5)	315
Changes in operating assets and liabilities, net of effects from acquisitions and dispositions:
Accounts receivable	144	99
Prepaid expenses and other assets	(182)	(67)
Accounts payable, accrued liabilities and other	149	(155)
Net cash flows from operating activities	3,751	3,220
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(1,821)	(1,461)
Change in accrued expenses related to capital expenditures	(75)	(388)
Real estate investment through variable interest entity	(50)	(38)
Other, net	(10)	37
Net cash flows from investing activities	(1,956)	(1,850)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	5,289	4,339
Repayments of long-term debt	(3,164)	(3,589)
Payments for debt issuance costs	(22)	(41)
Issuance of equity	0	23
Purchase of treasury stock	(3,652)	(2,352)
Proceeds from exercise of stock options	9	93
Purchase of noncontrolling interest	(507)	(393)
Distributions to noncontrolling interest	(39)	(39)
Borrowings for real estate investments through variable interest entities	50	0
Other, net	12	(24)
Net cash flows from financing activities	(2,024)	(1,983)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(229)	(613)
CASH AND CASH EQUIVALENTS, beginning of period	1,001	3,549
CASH AND CASH EQUIVALENTS, end of period	772	2,936
CASH PAID FOR INTEREST	1,017	1,050
CASH PAID FOR TAXES	$ 20	$ 19