Investments in Affiliates Significant Affiliates Financial Statements (Unaudited) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets, Current	$ 8,436	$ 7,465	$ 8,436	$ 7,465
Assets, Noncurrent	9,571	10,057	9,571	10,057
Total assets	18,007	17,522	18,007	17,522
Liabilities, Current	4,207	4,046	4,207	4,046
Liabilities, Noncurrent	5,239	5,376	5,239	5,376
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	8,561	8,100	8,561	8,100	$ 4,011	$ 3,670
Total liabilities and shareholders' equity	18,007	17,522	18,007	17,522
Revenues	4,134	4,212	15,618	13,066	14,357
Gross profit	591	779
Net income			609	1,822	1,009
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Assets, Current	794	1,140	794	1,140
Assets, Noncurrent	3,163	3,210	3,163	3,210
Total assets	3,957	4,350	3,957	4,350
Liabilities, Current	194	166	194	166
Liabilities, Noncurrent	112	101	112	101
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,651	4,083	3,651	4,083
Total liabilities and shareholders' equity	$ 3,957	$ 4,350	3,957	4,350
Revenues			599	553	531
Gross profit			(244)	(71)	59
Net income			$ (393)	$ (154)	$ 35