Income Taxes, Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount
Income tax expense at statutory rates, amount		$ 671	$ 828	$ 957
U.S. state and Canadian provincial tax expense, net of federal income tax effect		104	124	83
Permanent differences:
Manufacturing deduction				(42)
Other permanent differences		(26)	(9)	(9)
GILTI tax	[1]	115	67
Foreign tax credits		(95)	(50)
Repatriation withholding tax		45
Effects of Tax Reform/Change in tax law	[1]		(12)	(1,862)
Tax effects of income associated with noncontrolling interests		(75)	(49)	(31)
Other, net		(37)	(20)	(45)
Income tax expense		$ 702	$ 879	$ (949)
Effective Income Tax Rate Reconciliation, Percent
Income tax expense at statutory rates (percent)		19.20%	19.60%	29.80%
U.S. state and Canadian provincial tax expense, net of federal income tax effect (percent)		3.00%	2.90%	2.60%
Permanent differences:
Manufacturing deduction (percent)				(1.30%)
Other (percent)		(0.70%)	(0.20%)	(0.30%)
GILTI tax (percent)	[1]	3.30%	1.60%
Foreign tax credits (percent)		(2.70%)	(1.20%)
Repatriation withholding tax (percent)		1.30%
Effects of Tax Reform/Change in tax law (percent)	[1]		(0.30%)	(58.10%)
Tax effects of income associated with noncontrolling interests (percent)		(2.20%)	(1.20%)	(1.00%)
Other, net (percent)		(1.10%)	(0.50%)	(1.40%)
Income tax expense (benefit) (percent)		20.10%	20.70%	(29.70%)
U.S. [Member]
Effective Income Tax Rate Reconciliation, Amount
Income tax expense at statutory rates, amount		$ 524	$ 665	$ 799
U.S. state and Canadian provincial tax expense, net of federal income tax effect		16	44	37
Permanent differences:
Manufacturing deduction				(42)
Other permanent differences		(36)	(9)	(9)
GILTI tax	[1]	115	67
Foreign tax credits		(95)	(50)
Repatriation withholding tax		45
Effects of Tax Reform/Change in tax law	[1]		(12)	(1,862)
Tax effects of income associated with noncontrolling interests		(77)	(49)	(31)
Other, net		(36)	(23)	(52)
Income tax expense		$ 456	$ 633	$ (1,160)
Effective Income Tax Rate Reconciliation, Percent
Income tax expense at statutory rates (percent)		21.00%	21.00%	35.00%
U.S. state and Canadian provincial tax expense, net of federal income tax effect (percent)		0.70%	1.40%	1.60%
Permanent differences:
Manufacturing deduction (percent)				(1.80%)
Other (percent)		(1.50%)	(0.30%)	(0.40%)
GILTI tax (percent)	[1]	4.60%	2.10%
Foreign tax credits (percent)		(3.80%)	(1.60%)
Repatriation withholding tax (percent)		1.80%
Effects of Tax Reform/Change in tax law (percent)	[1]		(0.40%)	(81.60%)
Tax effects of income associated with noncontrolling interests (percent)		(3.10%)	(1.50%)	(1.40%)
Other, net (percent)		(1.40%)	(0.70%)	(2.30%)
Income tax expense (benefit) (percent)		18.30%	20.00%	(50.90%)
International [Member]
Effective Income Tax Rate Reconciliation, Amount
Income tax expense at statutory rates, amount		$ 147	$ 163	$ 158
U.S. state and Canadian provincial tax expense, net of federal income tax effect		88	80	46
Permanent differences:
Manufacturing deduction				0
Other permanent differences		10	0	0
GILTI tax	[1]	0	0
Foreign tax credits		0	0
Repatriation withholding tax		0
Effects of Tax Reform/Change in tax law	[1]		0	0
Tax effects of income associated with noncontrolling interests		2	0	0
Other, net		(1)	3	7
Income tax expense		$ 246	$ 246	$ 211
Effective Income Tax Rate Reconciliation, Percent
Income tax expense at statutory rates (percent)		14.80%	15.30%	17.10%
U.S. state and Canadian provincial tax expense, net of federal income tax effect (percent)		8.90%	7.50%	5.00%
Permanent differences:
Manufacturing deduction (percent)				0.00%
Other (percent)		1.00%	0.00%	0.00%
GILTI tax (percent)	[1]	0.00%	0.00%
Foreign tax credits (percent)		0.00%	0.00%
Repatriation withholding tax (percent)		0.00%
Effects of Tax Reform/Change in tax law (percent)	[1]		0.00%	0.00%
Tax effects of income associated with noncontrolling interests (percent)		0.20%	0.00%	0.00%
Other, net (percent)		(0.10%)	0.30%	0.80%
Income tax expense (benefit) (percent)		24.80%	23.10%	22.90%

[1] See “Tax Reform” below for a discussion of the changes in tax law in the U.S. that were enacted in December 2017.