Summarized Financial Information - Summarized Balance Sheets (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Condensed Financial Statements Captions [Line Items]
Current assets		$ 4,692	$ 3,427
Current liabilities		3,629	2,282
Parent Company, Subsidiary Issuer And Guarantor Subsidiaries [Member]
Condensed Financial Statements Captions [Line Items]
Current assets		3,931	2,464
Noncurrent assets	[1]	14,443	14,596
Current liabilities		2,553	1,472
Noncurrent liabilities	[2]	$ 14,353	$ 15,800

[1] Includes amounts due from non-guarantor subsidiaries of $6.3 billion and $6.5 billion as of September 30, 2020 and December 31, 2019, respectively.

[2] Includes amounts due to non-guarantor subsidiaries of $0.4 billion and $1.4 billion as of September 30, 2020 and December 31, 2019, respectively.