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Income Taxes - Income Tax Expense (Benefit) Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense at U.S. federal statutory income tax rate	$ 1,558	$ 1,295	$ 1,341
State and local tax expense	219	117	282
Non-U.S. income taxed at other than the U.S. federal statutory tax rate	(1)	166	90
U.S. tax impact on Non-U.S. income and activities	(160)	(197)	(822)
Change in valuation allowances	370	(233)	1,695
Change in tax laws	0	(122)	(134)
General business credits and manufacturing incentives	(366)	(420)	(695)
Capital loss expiration	0	0	107
Settlements of prior year tax matters	(18)	0	(188)
Realization of basis differences in affiliates	(12)	0	(59)
Foreign currency remeasurement	(7)	74	19
Other adjustments	191	89	(172)
Total income tax expense	1,774	769	474
Germany
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Change in tax laws	$ 0	$ 0	$ (990)

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- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits (or reversals of expired tax credits). Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Effective Income Tax Rate Reconciliation, Foreign Currency Remeasurement, Amount

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Effective Income Tax Rate Reconciliation, Other Adjustments, Capital Loss Expiration

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the realization of basis differences in affiliates.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to repatriation of foreign earnings, unremitted foreign earnings, and U.S. taxes on other non-U.S. income in the period.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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