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Employee Benefits (Composition of Fair Value of the Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Levels of fair value hierarchy [Line Items]
Equity instruments	$ 247	$ 200
Debt instruments	308	283
Deposits with insurance companies	28	35
Fair value of plan assets	583	518
With quoted market price [Member]
Levels of fair value hierarchy [Line Items]
Equity instruments	237	200
Debt instruments	197	164
Without quoted market price [Member]
Levels of fair value hierarchy [Line Items]
Equity instruments	10	0
Debt instruments	$ 111	$ 119

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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