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Employee Benefits (Composition of Fair Value of the Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Levels of fair value hierarchy [Line Items]
Debt instruments	$ 324	$ 259
Deposits with insurance companies	110	88
Fair value of plan assets	631	552
With quoted market price [Member]
Levels of fair value hierarchy [Line Items]
Equity instruments	197	205
Debt instruments	179	133
Without quoted market price [Member]
Levels of fair value hierarchy [Line Items]
Debt instruments	$ 145	$ 126

X

- Definition

The amount that instruments representing debt (rather than equity) constitute of 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 that instruments representing equity (rather than debt) constitute of 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 that other types of assets not separately disclosed constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

+ References

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- Definition

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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