Income Taxes, Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Amount
Income tax expense (benefit) at statutory rates		$ 3,071	$ 288		$ (445)
U.S. state and Canadian provincial tax expense, net of federal income tax effect		437	69		(6)
Permanent differences		(77)	(48)		(8)
Changes in tax law			64	[1]	21
CARES Act	[2]		(56)		(360)
GILTI tax		413	125
Lapse of federal statute of limitations					(39)
Foreign tax credits		(396)	(103)
Repatriation withholding tax		51
Settlements			(22)
Tax effects of income associated with noncontrolling interests		(53)	(44)		(74)
Other, net		(18)	(18)		8
Income tax expense (benefit)		$ 3,428	$ 255		$ (903)
Effective Income Tax Rate Reconciliation, Percent
Income tax expense (benefit) at statutory rates (percent)		20.10%	18.70%		22.10%
U.S. state and Canadian provincial tax expense (benefit), net of federal income tax effect (percent)		2.80%	4.50%		0.30%
Permanent differences (percent)		(0.50%)	(3.10%)		0.40%
Change in tax law (percent)			4.10%	[1]	(1.00%)
CARES Act (percent)	[2]		(3.60%)		17.90%
GILTI tax (percent)		2.70%	8.10%
Lapse of federal statute of limitations (percent)					1.90%
Foreign tax credits (percent)		(2.60%)	(6.70%)
Repatriation withholding tax (percent)		0.30%
Settlements (percent)			(1.40%)
Tax effects of income associated with noncontrolling interests (percent)		(0.30%)	(2.90%)		3.70%
Other, net (percent)		(0.10%)	(1.20%)		(0.40%)
Income tax expense (benefit) (percent)		22.40%	16.50%		44.90%
U.S. [Member]
Effective Income Tax Rate Reconciliation, Amount
Income tax expense (benefit) at statutory rates		$ 2,460	$ 215		$ (435)
U.S. state and Canadian provincial tax expense, net of federal income tax effect		182	16		(33)
Permanent differences		(61)	(34)		(23)
Changes in tax law			(10)	[1]	0
CARES Act	[2]		(56)		(360)
GILTI tax		413	125
Lapse of federal statute of limitations					(39)
Foreign tax credits		(396)	(103)
Repatriation withholding tax		51
Settlements			(22)
Tax effects of income associated with noncontrolling interests		(78)	(74)		(66)
Other, net		(27)	(7)		7
Income tax expense (benefit)		$ 2,544	$ 50		$ (949)
Effective Income Tax Rate Reconciliation, Percent
Income tax expense (benefit) at statutory rates (percent)		21.00%	21.00%		21.00%
U.S. state and Canadian provincial tax expense (benefit), net of federal income tax effect (percent)		1.60%	1.60%		1.60%
Permanent differences (percent)		(0.50%)	(3.30%)		1.10%
Change in tax law (percent)			(1.00%)	[1]	0.00%
CARES Act (percent)	[2]		(5.50%)		17.40%
GILTI tax (percent)		3.50%	12.20%
Lapse of federal statute of limitations (percent)					1.80%
Foreign tax credits (percent)		(3.40%)	(10.10%)
Repatriation withholding tax (percent)		0.40%
Settlements (percent)			(2.10%)
Tax effects of income associated with noncontrolling interests (percent)		(0.70%)	(7.20%)		3.20%
Other, net (percent)		(0.20%)	(0.70%)		(0.30%)
Income tax expense (benefit) (percent)		21.70%	4.90%		45.80%
Foreign [Member]
Effective Income Tax Rate Reconciliation, Amount
Income tax expense (benefit) at statutory rates		$ 611	$ 73		$ (10)
U.S. state and Canadian provincial tax expense, net of federal income tax effect		255	53		27
Permanent differences		(16)	(14)		15
Changes in tax law			74	[1]	21
CARES Act	[2]		0		0
GILTI tax		0	0
Lapse of federal statute of limitations					0
Foreign tax credits		0	0
Repatriation withholding tax		0
Settlements			0
Tax effects of income associated with noncontrolling interests		25	30		(8)
Other, net		9	(11)		1
Income tax expense (benefit)		$ 884	$ 205		$ 46
Effective Income Tax Rate Reconciliation, Percent
Income tax expense (benefit) at statutory rates (percent)		17.00%	14.00%		(16.10%)
U.S. state and Canadian provincial tax expense (benefit), net of federal income tax effect (percent)		7.10%	10.20%		43.50%
Permanent differences (percent)		(0.50%)	(2.70%)		24.20%
Change in tax law (percent)			14.20%	[1]	33.90%
CARES Act (percent)	[2]		0.00%		0.00%
GILTI tax (percent)		0.00%	0.00%
Lapse of federal statute of limitations (percent)					0.00%
Foreign tax credits (percent)		0.00%	0.00%
Repatriation withholding tax (percent)		0.00%
Settlements (percent)			0.00%
Tax effects of income associated with noncontrolling interests (percent)		0.70%	5.80%		(12.90%)
Other, net (percent)		0.30%	(2.10%)		1.60%
Income tax expense (benefit) (percent)		24.60%	39.40%		74.20%

[1] During the three months ended June 30, 2021, certain statutory income tax rate changes (primarily an increase in the U.K. rate from 19 percent to 25 percent effective in 2023) were enacted that resulted in the remeasurement of our deferred tax liabilities and related deferred income tax expense.

[2] See “CARES Act” on page 123 for a discussion of significant changes in tax law in the U.S. that were enacted in 2020.