Income Taxes, Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount
Income tax expense (benefit) at statutory rates		$ 2,409	$ 3,071	$ 288
U.S. state and Canadian provincial tax expense, net of federal income tax effect		275	437	69
Permanent differences		(105)	(77)	(48)
Changes in tax law	[1]			64
CARES Act	[2]			(56)
GILTI tax		167	413	125
Foreign tax credits		(149)	(396)	(103)
Repatriation withholding tax		45	51
Settlements				(22)
Tax effects of income associated with noncontrolling interests		(54)	(53)	(44)
Other, net		31	(18)	(18)
Income tax expense		$ 2,619	$ 3,428	$ 255
Effective Income Tax Rate Reconciliation, Percent
Income tax expense (benefit) at statutory rates (percent)		20.50%	20.10%	18.70%
U.S. state and Canadian provincial tax expense (benefit), net of federal income tax effect (percent)		2.30%	2.80%	4.50%
Permanent differences (percent)		(0.90%)	(0.50%)	(3.10%)
Change in tax law (percent)	[1]			4.10%
CARES Act (percent)	[2]			(3.60%)
GILTI tax (percent)		1.40%	2.70%	8.10%
Foreign tax credits (percent)		(1.30%)	(2.60%)	(6.70%)
Repatriation withholding tax (percent)		0.40%	0.30%
Settlements (percent)				(1.40%)
Tax effects of income associated with noncontrolling interests (percent)		(0.40%)	(0.30%)	(2.90%)
Other, net (percent)		0.30%	(0.10%)	(1.20%)
Income tax expense (percent)		22.30%	22.40%	16.50%
U.S. [Member]
Effective Income Tax Rate Reconciliation, Amount
Income tax expense (benefit) at statutory rates		$ 1,960	$ 2,460	$ 215
U.S. state and Canadian provincial tax expense, net of federal income tax effect		114	182	16
Permanent differences		(87)	(61)	(34)
Changes in tax law	[1]			(10)
CARES Act	[2]			(56)
GILTI tax		167	413	125
Foreign tax credits		(149)	(396)	(103)
Repatriation withholding tax		45	51
Settlements				(22)
Tax effects of income associated with noncontrolling interests		(84)	(78)	(74)
Other, net		8	(27)	(7)
Income tax expense		$ 1,974	$ 2,544	$ 50
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)		1.20%	1.60%	1.60%
Permanent differences (percent)		(0.90%)	(0.50%)	(3.30%)
Change in tax law (percent)	[1]			(1.00%)
CARES Act (percent)	[2]			(5.50%)
GILTI tax (percent)		1.80%	3.50%	12.20%
Foreign tax credits (percent)		(1.60%)	(3.40%)	(10.10%)
Repatriation withholding tax (percent)		0.50%	0.40%
Settlements (percent)				(2.10%)
Tax effects of income associated with noncontrolling interests (percent)		(0.90%)	(0.70%)	(7.20%)
Other, net (percent)		0.00%	(0.20%)	(0.70%)
Income tax expense (percent)		21.10%	21.70%	4.90%
Foreign [Member]
Effective Income Tax Rate Reconciliation, Amount
Income tax expense (benefit) at statutory rates		$ 449	$ 611	$ 73
U.S. state and Canadian provincial tax expense, net of federal income tax effect		161	255	53
Permanent differences		(18)	(16)	(14)
Changes in tax law	[1]			74
CARES Act	[2]			0
GILTI tax		0	0	0
Foreign tax credits		0	0	0
Repatriation withholding tax		0	0
Settlements				0
Tax effects of income associated with noncontrolling interests		30	25	30
Other, net		23	9	(11)
Income tax expense		$ 645	$ 884	$ 205
Effective Income Tax Rate Reconciliation, Percent
Income tax expense (benefit) at statutory rates (percent)		18.50%	17.00%	14.00%
U.S. state and Canadian provincial tax expense (benefit), net of federal income tax effect (percent)		6.60%	7.10%	10.20%
Permanent differences (percent)		(0.70%)	(0.50%)	(2.70%)
Change in tax law (percent)	[1]			14.20%
CARES Act (percent)	[2]			0.00%
GILTI tax (percent)		0.00%	0.00%	0.00%
Foreign tax credits (percent)		0.00%	0.00%	0.00%
Repatriation withholding tax (percent)		0.00%	0.00%
Settlements (percent)				0.00%
Tax effects of income associated with noncontrolling interests (percent)		1.20%	0.70%	5.80%
Other, net (percent)		0.90%	0.30%	(2.10%)
Income tax expense (percent)		26.50%	24.60%	39.40%

[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] Upon filing our superseding 2020 federal income tax return in the fourth quarter of 2021, we recorded an additional tax benefit during the year ended December 31, 2021 related to the additional 2020 tax net operating loss (NOL) carryback to 2015, as permitted by the Coronavirus Aid, Relief and Economic Security (CARES) Act enacted on March 27, 2020.