Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ 548		$ 652
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation, amortization and accretion	1,207		1,175
Gains (losses) on retirement of long-term obligations	95	[1]	2
Amortization of deferred financing costs and other non-cash interest, net	4		1
Stock-based compensation expense	108		91
Asset write-down charges	10		13
Deferred income tax (benefit) provision	2		2
Other non-cash adjustments	4		4
Changes in assets and liabilities, excluding the effects of acquisitions:
Increase (decrease) in accrued interest	(46)		(38)
Increase (decrease) in accounts payable	(41)		37
Increase (decrease) in other liabilities	58		179
Decrease (increase) in receivables	141		(166)
Decrease (increase) in other assets	(20)		(62)
Net cash provided by (used for) operating activities	2,070		1,890
Cash flows from investing activities:
Capital expenditures	(1,238)		(1,537)
Payments for acquisitions, net of cash acquired	(86)		(15)
Other investing activities, net	(12)		3
Net cash provided by (used for) investing activities	(1,336)		(1,549)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	3,733		1,895
Principal payments on debt and other long-term obligations	(80)		(59)
Purchases and redemptions of long-term debt	(2,490)		(12)
Borrowings under revolving credit facility	2,140		1,585
Payments under revolving credit facility	(2,145)		(2,270)
Net issuances (repayments) under commercial paper program	(80)		0
Payments for financing costs	(38)		(24)
Purchases of Common Stock	(75)		(44)
Dividends/distributions paid on common stock	(1,531)		(1,415)
Dividends/distributions paid on preferred stock	(85)		(85)
Net cash provided by (used for) financing activities	(651)		(429)
Net increase (decrease) in cash, cash equivalents, and restricted cash	83		(88)
Cash, cash equivalents and restricted cash at beginning of period	338		413
Cash, cash equivalents and restricted cash at end of period	421		325
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of exchange rate changes	$ 0		$ 0

[1] Inclusive of the write off of respective deferred financing costs.