Investments and Noncontrolling Interests (Summary of Equity Method Investment Financial Information) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Revenue and other income	[1]	$ 2,067	$ 1,905	$ 1,227
Costs and expenses	[1]	943	1,024	659
Income (loss) from operations	[1]	1,124	881	568
Net income (loss)	[1]	967	803	478
Income from equity method investments	[1],[2]	290	247	78
Income (Loss) from Equity Method Investments from Asset Impairment and Elimination of Basis Differential		42
Current assets		864	667
Noncurrent assets		10,996	9,086
Current liabilities		437	438
Noncurrent liabilities		1,127	1,036
Other VIEs
Schedule of Equity Method Investments [Line Items]
Revenue and other income	[1]	650	484	273
Costs and expenses	[1]	375	286	139
Income (loss) from operations	[1]	275	198	134
Net income (loss)	[1]	215	197	133
Income from equity method investments	[1],[2]	103	67	30
Current assets		534	252
Noncurrent assets		5,862	3,796
Current liabilities		192	158
Noncurrent liabilities		305	191
Non-VIEs
Schedule of Equity Method Investments [Line Items]
Revenue and other income	[1]	1,417	1,421	954
Costs and expenses	[1]	568	738	520
Income (loss) from operations	[1]	849	683	434
Net income (loss)	[1]	752	606	345
Income from equity method investments	[1],[2]	187	180	$ 48
Current assets		330	415
Noncurrent assets		5,134	5,290
Current liabilities		245	280
Noncurrent liabilities		$ 822	$ 845

[1] The financial information for equity method investments for 2019 includes financial information of equity method investments acquired as part of the Merger. The financial information for equity method investments for 2018 includes financial information of equity method investments acquired as part of the Merger for the last three months of 2018. The financial information for equity method investments for 2017 does not include financial information of equity method investments acquired as part of the Merger. See Note 1 for additional information

[2] “Income from equity method investments” includes the impact of any basis differential amortization or accretion.