Restatement of Previously Issued Consolidated Financial Statements Restatement of Balance Sheet (Details) - USD ($) $ in Millions		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property and equipment, net		$ 14,666	$ 14,393	$ 14,128	$ 13,860	$ 13,653		$ 13,410	$ 13,195	$ 13,028
Assets		38,457	38,321	38,124	37,755	32,762		32,621	32,351	32,227
Deferred revenues		657	638	607	598	587		568	554	539
Liabilities, Current		1,920	1,847	1,802	1,661	1,506		1,388	1,364	1,261
Other long-term liabilities	[1]	2,516	2,458	2,411	2,369	3,110		3,074	3,014	2,946
Liabilities		27,968	27,535	27,111	26,488	21,191		20,775	20,222	19,823
Dividends/distributions in excess of earnings		(7,365)	(7,042)	(6,787)	(6,501)	(6,195)		(5,896)	(5,581)	(5,286)	$ (4,919)	$ (3,714)
Total equity		10,489	10,786	11,013	11,267	11,571		11,846	12,129	12,404	11,925	7,222
Liabilities and Equity		$ 38,457	38,321	38,124	37,755	32,762		32,621	32,351	32,227
Previously Reported [Member]
Property and equipment, net			14,416	14,151	13,883	13,676		13,433	13,218	13,051
Assets			38,344	38,147	37,778	32,785		32,644	32,374	32,250
Deferred revenues			525	503	502	498		484	476	465
Liabilities, Current			1,734	1,698	1,565	1,417		1,304	1,286	1,187
Other long-term liabilities	[1]		2,055	2,028	2,009	2,759		2,732	2,678	2,615
Liabilities			27,019	26,624	26,032	20,751		20,349	19,808	19,418
Dividends/distributions in excess of earnings			(6,503)	(6,277)	(6,022)	(5,732)		(5,447)	(5,144)	(4,858)	(4,505)	(3,379)
Total equity			11,325	11,523	11,746	12,034		12,295	12,566	12,832	12,339	7,557
Liabilities and Equity			38,344	38,147	37,778	32,785		32,644	32,374	32,250
Restatement Adjustment [Member]
Property and equipment, net			0	0	0	0		0	0	0
Assets			0	0	0	0		0	0	0
Deferred revenues			113	104	96	89		84	78	74
Liabilities, Current			113	104	96	89		84	78	74
Other long-term liabilities	[1]		403	383	360	351		342	336	331
Liabilities			516	487	456	440		426	414	405
Dividends/distributions in excess of earnings			(516)	(487)	(456)	(440)		(426)	(414)	(405)	(391)	(332)
Total equity			(516)	(487)	(456)	(440)		(426)	(414)	(405)	(391)	(332)
Liabilities and Equity			0	0	0	0		0	0	0
Other Adjustments [Domain]
Property and equipment, net			(23)	(23)	(23)	(23)		(23)	(23)	(23)
Assets			(23)	(23)	(23)	(23)		(23)	(23)	(23)
Deferred revenues			0	0	0	0		0	0	0
Liabilities, Current			0	0	0	0		0	0	0
Other long-term liabilities			0	0	0	0	[1]	0	0	0
Liabilities			0	0	0	0		0	0	0
Dividends/distributions in excess of earnings			(23)	(23)	(23)	(23)		(23)	(23)	(23)	(23)	(3)
Total equity			(23)	(23)	(23)	(23)		(23)	(23)	(23)	$ (23)	$ (3)
Liabilities and Equity			$ (23)	$ (23)	$ (23)	$ (23)		$ (23)	$ (23)	$ (23)

[1] See "Recently Adopted Accounting Pronouncements" in note 3 to the consolidated financial statements for a discussion of the recently adopted new lease standard.