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Pension Benefits (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Payment for Pension Benefits |  |  |  |  |  | $ 5,000,000 |  | $ 12,000,000 |
UNITED STATES |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Net periodic benefit cost | $ 5,000,000 |  | $ 4,000,000 |  |  | 11,000,000 |  | 8,000,000 |
UNITED STATES | General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Service cost | 2,000,000 |  | 3,000,000 |  |  | 4,000,000 |  | 6,000,000 |
UNITED STATES | Other pension (income) expense [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Interest cost | 9,000,000 |  | 10,000,000 |  |  | 18,000,000 |  | 20,000,000 |
Expected return on plan assets | (11,000,000) |  | (11,000,000) |  |  | (21,000,000) |  | (23,000,000) |
Amortization of net loss | 3,000,000 |  | 1,000,000 |  |  | 7,000,000 |  | 3,000,000 |
Amortization of prior service cost | 2,000,000 |  | 1,000,000 |  |  | 3,000,000 |  | 2,000,000 |
Additional loss (gain) recognized due to settlements |  |  | (3,000,000) |  |  |  |  | (8,000,000) |
Pension data adjustment | $ 0 | [1] | $ 0 | [1] | $ 22,000,000 | $ 0 | [1] | $ 22,000,000 | [1]
[1] | Reflects a non-cash, out-of-year charge related to the adjustment of certain historical deferred vested liability balances in the Plan during the first quarter of 2017 recorded in Other pension (income) expense. See Note 5.

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