Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents		$ 1,040	$ 627
Restricted Cash and Cash Equivalents, Current		212	227
Restricted Cash and Cash Equivalents, Noncurrent		16	29
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		1,268	883	$ 1,283	$ 1,003
Interest paid, net of amounts capitalized		1,723	1,713	1,715
Income Taxes Paid, Net	[1]	(850)	(780)	(540)
Capital Expenditures Incurred but Not yet Paid		888	823	653
Capital Expenditures Incurred Deferred Payments		0	0	100
Related Party Transaction, Cash Received for Income Taxes, Net		$ 900	$ 900	$ 636

[1] Includes $942 million, $884 million and $636 million of income taxes received from Berkshire Hathaway in 2019, 2018 and 2017, respectively.