CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income	$ 2,079	$ 1,343
Adjustments to reconcile consolidated net income to net cash flows from operating activities:
Depreciation and amortization	4,795	4,925
Stock compensation expense	234	180
Noncash interest income, net	(15)	(21)
Deferred income taxes	371	101
Other, net	124	279
Changes in operating assets and liabilities, net of effects from acquisitions and dispositions:
Accounts receivable	(44)	170
Prepaid expenses and other assets	(113)	(101)
Accounts payable, accrued liabilities and other	319	(127)
Net cash flows from operating activities	7,750	6,749
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(3,702)	(3,338)
Change in accrued expenses related to capital expenditures	(125)	(174)
Real estate investment through variable interest entity	(123)	(81)
Other, net	(22)	(8)
Net cash flows from investing activities	(3,972)	(3,601)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	10,958	7,322
Repayments of long-term debt	(5,759)	(7,892)
Payments for debt issuance costs	(58)	(62)
Issuance of equity	0	23
Purchase of treasury stock	(7,168)	(3,507)
Proceeds from exercise of stock options	26	121
Purchase of noncontrolling interest	(1,090)	(518)
Distributions to noncontrolling interest	(71)	(77)
Borrowings for real estate investments through variable interest entities	123	20
Other, net	(29)	(25)
Net cash flows from financing activities	(3,068)	(4,595)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	710	(1,447)
CASH AND CASH EQUIVALENTS, beginning of period	1,001	3,549
CASH AND CASH EQUIVALENTS, end of period	1,711	2,102
CASH PAID FOR INTEREST	1,996	1,985
CASH PAID FOR TAXES	$ 69	$ 50