Postretirement Benefit Plans (Details Textual) - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Number of years eligible employees can receive transition credits	5 years
Minimum age plus years of service to be eligible to receive transition credits	60 years
Liability for transition credits	$ 1,000,000	$ 2,000,000
Number of shares held by employees in Employee Stock Ownership Plan	391	414
Increase in funded status				$ 10,000,000
Loss on amendment				3,000,000
Loss on amendment, net of tax				1,000,000
Prior service credit				13,000,000
Prior service credit, net of tax				$ 8,000,000
Charge resulting from curtailment or settlement recorded	$ 0	$ 0	$ 1,000,000
Prior service credit	(13,000,000)	(15,000,000)
Net actuarial losses, net of tax	9,000,000
Net actuarial losses expected to be recognized next fiscal year, before tax	(13,000,000)
Prior service cost expected to be recognized next fiscal year, before tax	3,000,000
Prior service cost expected to be recognized next fiscal year, net of tax	2,000,000
Accumulated benefit obligation	$ 827,000,000	746,000,000
Expected long-term return on plan assets	7.30%
Assumed rate of health care costs increases, next fiscal year	8.14%
Ultimate assumed average annual health care cost increases	4.50%
Effect of increase in health care trends by one percent per year on annual service interest (less than $1 million)	$ 1,000,000
Effect of decrease in health care trends by one percent per year on annual service interest (less than $1 million)	1,000,000
Effect of increase in health care trends by one percent per year on benefit obligation	5,000,000
Effect of decrease in health care trends by one percent per year on benefit obligation	4,000,000
Estimated pension plan contributions during the next fiscal quarter	6,000,000
International defined benefit pension plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Acquisitions	83,000,000	0
Charge resulting from curtailment or settlement recorded	0	0	1,000,000
Net actuarial losses, before tax	(8,000,000)	(13,000,000)	(7,000,000)
Employer Contribution to defined benefit Plan	20,000,000	19,000,000
Pension
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Prior service credit	(1,000,000)	0
Employer Contribution to defined benefit Plan	27,000,000
Other Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Prior service credit	(12,000,000)	(15,000,000)
Plan amendment	0	1,000,000
Net actuarial losses, before tax	(3,000,000)	(3,000,000)	(2,000,000)
Prior service credit, before tax	$ (3,000,000)	(3,000,000)	$ (1,000,000)
Employer Contribution to defined benefit Plan		25,000,000
Minimum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Employer matching contribution	3.00%
Estimated pension plan contributions during next fiscal year	$ 20,000,000
Maximum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Employer matching contribution	7.00%
Estimated pension plan contributions during next fiscal year	$ 30,000,000
Hedge funds
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Portion of hedge fund with no lockup or gate	$ 109,000,000
Portion of hedge fund with no lockup or gate, percent of fund	61.00%
Unfunded commitments	$ 5,000,000	6,000,000
Private equity
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Unfunded commitments	7,000,000	$ 4,000,000
Sensus
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets	9,000,000
Acquisitions	$ 96,000,000