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Employee Benefits (Sensitivity Analysis) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Actuarial assumptions [Line Items]
Defined benefit obligation	$ 1,068	$ 934
Discount rate [Member] | Decrease 10% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	(37)
Discount rate [Member] | Decrease 5% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	(18)
Discount rate [Member] | Increase 5% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	19
Discount rate [Member] | Increase 10% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	37
Salary increase [Member] | Decrease 10% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	24
Salary increase [Member] | Decrease 5% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	12
Salary increase [Member] | Increase 5% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	(13)
Salary increase [Member] | Increase 10% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	(25)
Mortality table [Member] | Decrease 10% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	(22)
Mortality table [Member] | Decrease 5% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	(11)
Mortality table [Member] | Increase 5% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	10
Mortality table [Member] | Increase 10% [Member]
Actuarial assumptions [Line Items]
Defined benefit obligation	$ 21

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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