SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - BALANCE SHEETS (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 559	$ 960	$ 108
Due from affiliates	23	20	32
Income taxes receivable	79	113	112
Other current assets	209	149	163
Total current assets	4,375	4,511	3,339
Due from affiliates	637	780	742
Deferred income taxes	151	136	155
Other long-term assets	1,244	753	732
Total assets	72,045	66,623	65,665
Liabilities and shareholders’ equity:
Short-term debt	3,471	885	3,505
Current portion of long-term debt	106	1,540	1,526
Due to affiliates	0	45	5
Other current liabilities	1,131	1,016	866
Total current liabilities	10,035	6,839	9,150
Long-term debt	21,068	21,781	20,785
Due to affiliates	287	234	195
Commitments and contingencies (Note 4)
Total shareholders’ equity	25,981	23,373	19,929
Total liabilities and shareholders’ equity	72,045	66,623	65,665
Parent Company
ASSETS
Cash and cash equivalents	186	366	6
Restricted cash	2	0	0
Due from affiliates	446	58	98
Income taxes receivable	0	42	0
Other current assets	31	26	34
Total current assets	665	492	138
Investments in subsidiaries	33,308	33,898	32,604
Due from affiliates	21	1	3
Deferred income taxes	626	2,187	1,766
Other long-term assets	1,090	717	682
Total assets	35,710	37,295	35,193
Liabilities and shareholders’ equity:
Short-term debt	1,240	0	0
Current portion of long-term debt	0	850	1,399
Due to affiliates	185	224	369
Income taxes payable, net	4	0	274
Other current liabilities	531	536	561
Total current liabilities	1,960	1,610	2,603
Long-term debt	5,969	7,317	8,856
Due to affiliates	1,151	4,375	3,138
Other long-term liabilities	649	620	667
Commitments and contingencies (Note 4)
Total shareholders’ equity	25,981	23,373	19,929
Total liabilities and shareholders’ equity	$ 35,710	$ 37,295	$ 35,193