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Pension Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]          
Payment for Pension Benefits       $ 9,000,000 $ 47,000,000
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits $ 1,000,000 $ 2,000,000   1,000,000 2,000,000
UNITED STATES          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic benefit cost 5,000,000 4,000,000   16,000,000 12,000,000
UNITED STATES | General and Administrative Expense [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 1,000,000 2,000,000   5,000,000 8,000,000
UNITED STATES | Other pension (income) expense [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Interest cost 9,000,000 9,000,000   27,000,000 29,000,000
Expected return on plan assets (10,000,000) (10,000,000)   (31,000,000) (33,000,000)
Amortization of net loss 4,000,000 1,000,000   11,000,000 4,000,000
Amortization of prior service cost 1,000,000 2,000,000   4,000,000 4,000,000
Additional loss (gain) recognized due to settlements [1] 0 (8,000,000)   0 (16,000,000)
Pension data adjustment $ 0 [2] $ 0 [2] $ 22,000,000 $ 0 [2] $ 22,000,000 [2]
[1] Losses are a result of settlement transactions which exceeded the sum of annual service and interest costs for the applicable plan. These losses were recorded in Other pension (income) expense.
[2] 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.