Income Taxes, Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount
Income tax expense (benefit) at statutory rates		$ 288		$ (445)	$ 671
U.S. state and Canadian provincial tax expense, net of federal income tax effect		69		(6)	104
Permanent differences		(48)		(8)	(26)
Change in tax law		64	[1]	21
CARES Act	[2]	(56)		(360)
GILTI tax		125			115
Foreign tax credits		(103)			(95)
Settlements		(22)
Tax effects of income associated with noncontrolling interests		(44)		(74)	(75)
Other, net		(18)		8	(37)
Lapse of federal statute of limitations				(39)
Repatriation withholding tax					45
Income tax expense (benefit)		$ 255		$ (903)	$ 702
Effective Income Tax Rate Reconciliation, Percent
Income tax expense (benefit) at statutory rates (percent)		18.70%		22.10%	19.20%
U.S. state and Canadian provincial tax expense (benefit), net of federal income tax effect (percent)		4.50%		0.30%	3.00%
Permanent differences (percent)		(3.10%)		0.40%	(0.70%)
Change in tax law (percent)		4.10%	[1]	(1.00%)
CARES Act (percent)	[2]	(3.60%)		17.90%
GILTI tax (percent)		8.10%			3.30%
Foreign tax credits (percent)		(6.70%)			(2.70%)
Settlements (percent)		(1.40%)
Tax effects of income associated with noncontrolling interests (percent)		(2.90%)		3.70%	(2.20%)
Other, net (percent)		(1.20%)		(0.40%)	(1.10%)
Lapse of federal statute of limitations (percent)				1.90%
Repatriation withholding tax (percent)					1.30%
Income tax expense (benefit) (percent)		16.50%		44.90%	20.10%
U.S. [Member]
Effective Income Tax Rate Reconciliation, Amount
Income tax expense (benefit) at statutory rates		$ 215		$ (435)	$ 524
U.S. state and Canadian provincial tax expense, net of federal income tax effect		16		(33)	16
Permanent differences		(34)		(23)	(36)
Change in tax law		(10)	[1]	0
CARES Act	[2]	(56)		(360)
GILTI tax		125			115
Foreign tax credits		(103)			(95)
Settlements		(22)
Tax effects of income associated with noncontrolling interests		(74)		(66)	(77)
Other, net		(7)		7	(36)
Lapse of federal statute of limitations				(39)
Repatriation withholding tax					45
Income tax expense (benefit)		$ 50		$ (949)	$ 456
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%	0.70%
Permanent differences (percent)		(3.30%)		1.10%	(1.50%)
Change in tax law (percent)		(1.00%)	[1]	0.00%
CARES Act (percent)	[2]	(5.50%)		17.40%
GILTI tax (percent)		12.20%			4.60%
Foreign tax credits (percent)		(10.10%)			(3.80%)
Settlements (percent)		(2.10%)
Tax effects of income associated with noncontrolling interests (percent)		(7.20%)		3.20%	(3.10%)
Other, net (percent)		(0.70%)		(0.30%)	(1.40%)
Lapse of federal statute of limitations (percent)				1.80%
Repatriation withholding tax (percent)					1.80%
Income tax expense (benefit) (percent)		4.90%		45.80%	18.30%
Foreign [Member]
Effective Income Tax Rate Reconciliation, Amount
Income tax expense (benefit) at statutory rates		$ 73		$ (10)	$ 147
U.S. state and Canadian provincial tax expense, net of federal income tax effect		53		27	88
Permanent differences		(14)		15	10
Change in tax law		74	[1]	21
CARES Act	[2]	0		0
GILTI tax		0			0
Foreign tax credits		0			0
Settlements		0
Tax effects of income associated with noncontrolling interests		30		(8)	2
Other, net		(11)		1	(1)
Lapse of federal statute of limitations				0
Repatriation withholding tax					0
Income tax expense (benefit)		$ 205		$ 46	$ 246
Effective Income Tax Rate Reconciliation, Percent
Income tax expense (benefit) at statutory rates (percent)		14.00%		(16.10%)	14.80%
U.S. state and Canadian provincial tax expense (benefit), net of federal income tax effect (percent)		10.20%		43.50%	8.90%
Permanent differences (percent)		(2.70%)		24.20%	1.00%
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%
Foreign tax credits (percent)		0.00%			0.00%
Settlements (percent)		0.00%
Tax effects of income associated with noncontrolling interests (percent)		5.80%		(12.90%)	0.20%
Other, net (percent)		(2.10%)		1.60%	(0.10%)
Lapse of federal statute of limitations (percent)				0.00%
Repatriation withholding tax (percent)					0.00%
Income tax expense (benefit) (percent)		39.40%		74.20%	24.80%

[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 122 for a discussion of significant changes in tax law in the U.S. that were enacted in 2020.