Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments:
Equity-method investments	$ 309	$ 454
Other investments	21	22
Total investments	330	476
Unamortized basis difference for equity-method investments acquired	203	396
Net losses from equity-method investments	137	77	$ 18
Impairment on equity investments	121	58
RESTRICTED CASH	66	214
Borrowings for real estate investments through variable interest entities	0	342	0
Distributions to variable interest entities noncontrolling interest	0	107	0
Real estate investment through variable interest entity	$ 148	21	$ 105
Single-asset special purpose entity (SPE)
Investments:
Stated interest rate (percentage)	5.612%
Change in restricted cash	$ 148	214
Mortgages
Investments:
Other long-term liabilities	339	342
Noncontrolling Interests
Investments:
Other long-term liabilities	11	4
Current assets
Investments:
VIE assets	0	2
Restricted cash
Investments:
RESTRICTED CASH	66	214
Property, plant and equipment
Investments:
VIE assets	295	130
Current liabilities
Investments:
Current liabilities	11	0
Other long-term liabilities
Investments:
Other long-term liabilities	$ 350	$ 346

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