Restatement of Previously Issued Condensed Consolidated Financial Statements Restated condensed consolidated balance sheet (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Property and equipment, net of accumulated depreciation of $9,953 and $9,668, respectively	$ 14,815	$ 14,666	$ 13,860
Total Assets	38,616	38,457	37,755
Deferred revenues	741	657	598
Liabilities, Current	2,669	1,920	1,661
Other long-term liabilities	2,513	2,516	2,369
Liabilities	28,495	27,968	26,488
Dividends/distributions in excess of earnings	(7,712)	(7,365)	(6,501)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	10,121	10,489	11,267	$ 11,571
Liabilities and Equity	$ 38,616	$ 38,457	37,755
Previously Reported [Member]
Property and equipment, net of accumulated depreciation of $9,953 and $9,668, respectively			13,883
Total Assets			37,778
Deferred revenues			502
Liabilities, Current			1,565
Other long-term liabilities			2,009
Liabilities			26,032
Dividends/distributions in excess of earnings			(6,022)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			11,746
Liabilities and Equity			37,778
Restatement Adjustment [Member]
Property and equipment, net of accumulated depreciation of $9,953 and $9,668, respectively			0
Total Assets			0
Deferred revenues			96
Liabilities, Current			96
Other long-term liabilities			360
Liabilities			456
Dividends/distributions in excess of earnings			(456)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			(456)
Liabilities and Equity			0
Other Adjustment [Member]
Property and equipment, net of accumulated depreciation of $9,953 and $9,668, respectively			(23)
Total Assets			(23)
Deferred revenues			0
Liabilities, Current			0
Other long-term liabilities			0
Liabilities			0
Dividends/distributions in excess of earnings			(23)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			(23)
Liabilities and Equity			$ (23)