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Share-based Compensation and Employee Benefits - Schedule of Components of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial (loss) gain	$ (674)	$ (557)
Unrecognized prior service (cost) credit	(2)	(3)
Accumulated other comprehensive (loss) income	(676)	(560)
OPEB
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial (loss) gain	153	123
Unrecognized prior service (cost) credit	9	12
Accumulated other comprehensive (loss) income	$ 162	$ 135

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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