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Employee Benefit Plans (Summary of Net Periodic Benefit Cost) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial loss (gain)	$ 70
Unrecognized prior service cost (credit)	3
Int’l.
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial loss (gain)	23
Unrecognized prior service cost (credit)	(1)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial loss (gain)	0
Unrecognized prior service cost (credit)	$ (1)

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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