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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jan. 31, 2021
Income Tax Disclosure [Abstract]
Income tax expense (benefit) (Note 14)	$ 971	$ (112)	$ 2,148	$ 245
Valuation allowance against deferred tax assets					$ 316
Net deferred tax assets	$ 21,700		$ 21,700

X

- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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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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