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Employee Benefits (Composition of Fair Value of the Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Levels of fair value hierarchy [Line Items]
Equity instruments	$ 264	$ 247
Debt instruments	337	308
Deposits with insurance companies	28	28
Fair value of plan assets	629	583
With quoted market price [Member]
Levels of fair value hierarchy [Line Items]
Equity instruments	224	237
Debt instruments	334	307
Without quoted market price [Member]
Levels of fair value hierarchy [Line Items]
Equity instruments	40	10
Debt instruments	$ 3	$ 1

X

- Definition

The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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- Definition

The amount other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

+ References

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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