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Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation Allowance [Line Items]
Increase in income tax expense	$ 5,763
Income tax expense (benefit)	$ 5,715	$ (48)	$ (1,729)
Effect of change in U.S. tax rate		$ 2,020
Effective tax rate	27.80%	(0.50%)	80.00%
Loss carry forward	$ 13,731
Tax credit carryforward	1,198
Carry forward amount of foreign tax credit with expiration dates	10,536	$ 11,872
Tax Cuts and Jobs Act of 2017, existing undistributed accumulated earnings of foreign subsidiary	$ 59,900
Percentage of impact of unrecognized tax benefits on effective tax rate if subsequently recognized	82.00%
Unrecognized tax benefits	$ 5,070	4,828	$ 3,031	$ 3,042
Income tax accruals for anticipated interest and penalty obligations	33	178
Income tax benefit expense associated with interest and penalties	8	$ (161)	$ 38
Property, Plant and Equipment
Valuation Allowance [Line Items]
Decrease in deferred tax liabilities	400
Foreign Tax Credits and Tax Loss Carry Forwards
Valuation Allowance [Line Items]
Decrease in deferred tax assets	$ 1,800

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