Benefit Plans (Accumulated Other Comprehensive Income (Loss)) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
U.S. Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Prior service cost	$ 0
Unrecognized net actuarial gain (loss)	(16)
Total	(16)
Amounts expected to be reclassified to earnings in next fiscal year
Prior service cost	0
Unrecognized net actuarial gain (loss)	0
Total	0
Foreign Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Prior service cost	(1)
Unrecognized net actuarial gain (loss)	(1,370)
Total	(1,371)
Amounts expected to be reclassified to earnings in next fiscal year
Prior service cost	0
Unrecognized net actuarial gain (loss)	(41)
Total	$ (41)