Income Taxes (U.S. and foreign income (loss) from continuing operations before income taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income (loss) before income taxes, Income Tax Reconciliation [Abstract]
Income (loss) before taxes - United States	$ 8,024	$ (3,587)	$ 4,704
Income Loss Before Income Taxes Foreign	4,688	447	4,820
Income (loss) before income taxes	12,712	(3,140)	9,524
Federal statutory income tax	2,670	(659)	2,000
Non-U.S. effective tax rates	1,915	194	1,399
Tax impact of debt restructuring	75	0	0
Australia disposition	0	(349)	0
U.K. disposition	0	0	(732)
Recovery of outside basis	(55)	(22)	(77)
Adjustment to tax reserves	(11)	18	9
Adjustment to valuation allowances	(45)	460	(225)
State income tax	194	(112)	123
Malaysia Deepwater Incentive	0	0	(164)
Enhanced oil recovery credit	(99)	(6)	(27)
Other	(11)	(9)	(39)
Income tax provision	$ 4,633	$ (485)	$ 2,267
Income (loss) before income taxes, Percent of Pretax Income	63.10%	114.20%	49.40%
Income (loss) before income taxes, foregin, Percentage	36.90%	(14.20%)	50.60%
Income (Loss) Before Income Taxes In Percent	100.00%	100.00%	100.00%
Federal statutory rate percentage	21.00%	21.00%	21.00%
Non US effective tax rates percentage	15.10%	(6.20%)	14.70%
Tax legislation, percentage	0.60%	0.00%	0.00%
Australia disposition, percentage	0.00%	11.10%	0.00%
U.K. disposition, percentage	0.00%	0.00%	(7.70%)
Recovery of outside basis, percentage	(0.40%)	0.70%	(0.80%)
Adjustment to tax reserves, Percentage	(0.10%)	(0.60%)	0.10%
Adjustment to valuation allowances	(0.40%)	(14.60%)	(2.40%)
State income tax, percentage	1.50%	3.60%	1.30%
Malaysia Deepwater Tax Credits Incentive, Percentage	0.00%	0.00%	(1.70%)
Enhanced oil recovery, percentage	(0.80%)	0.20%	(0.30%)
Other, percentage	(0.10%)	0.30%	(0.40%)
Effective Income Tax Rate, Continuing Operations	36.40%	15.50%	23.80%