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Employee Benefits (Sensitivity Analysis) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | $ 860 | $ 1,068
Discount rate [Member] | Decrease 10% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | (32) |
Discount rate [Member] | Decrease 5% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | (16) |
Discount rate [Member] | Increase 5% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | 16 |
Discount rate [Member] | Increase 10% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | 32 |
Salary increase [Member] | Decrease 10% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | 18 |
Salary increase [Member] | Decrease 5% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | 9 |
Salary increase [Member] | Increase 5% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | (9) |
Salary increase [Member] | Increase 10% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | (18) |
Mortality table [Member] | Decrease 10% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | (17) |
Mortality table [Member] | Decrease 5% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | (9) |
Mortality table [Member] | Increase 5% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | 9 |
Mortality table [Member] | Increase 10% [Member] |  |
Actuarial assumptions [Line Items] |  |
Defined benefit obligation | $ 17 |

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- 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 -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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