Postretirement Benefit Plans (Details Textual) - USD ($) shares in Thousands		3 Months Ended			12 Months Ended
	Jul. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Number of years eligible employees can receive transition credits					5 years
Number of shares held by employees in Employee Stock Ownership Plan		302			302	328
Charge resulting from curtailment or settlement recorded					$ 9,000,000	$ 1,000,000	$ 1,000,000
Prior service credit		$ (4,000,000)			(4,000,000)	(8,000,000)
Net actuarial losses, net of tax					14,000,000
Net actuarial losses expected to be recognized next fiscal year, before tax		18,000,000			18,000,000
Prior service cost expected to be recognized next fiscal year, before tax		3,000,000			3,000,000
Prior service cost expected to be recognized next fiscal year, net of tax					2,000,000
Accumulated benefit obligation		$ 919,000,000			$ 919,000,000	829,000,000
Expected long-term return on plan assets		3.46%			3.46%
Assumed rate of health care costs increases, next fiscal year		6.53%			6.53%
Ultimate assumed average annual health care cost increases		4.50%			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					3,000,000
Effect of decrease in health care trends by one percent per year on benefit obligation					4,000,000
Employer Contribution to defined benefit Plan				$ 19,000,000
Estimated pension plan contributions during the next fiscal quarter		$ 5,000,000			5,000,000
Net loss					$ (83,000,000)	$ (37,000,000)	$ (19,000,000)
Expected long-term rate of return on plan assets					7.09%	7.34%	7.30%
Fair value of plan assets		605,000,000			$ 605,000,000	$ 567,000,000
Pension
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Prior service credit		3,000,000			3,000,000	4,000,000
Employer Contribution to defined benefit Plan					19,000,000
Fair value of plan assets		605,000,000			605,000,000	567,000,000
Other Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Prior service credit		(7,000,000)			(7,000,000)	(12,000,000)
Net actuarial losses, before tax					(2,000,000)	(2,000,000)	$ (2,000,000)
Prior service credit, before tax					(4,000,000)	(4,000,000)	(3,000,000)
Employer Contribution to defined benefit Plan						41,000,000
Net loss					2,000,000	(1,000,000)	5,000,000
Fair value of plan assets		0			$ 0	0
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		15,000,000			$ 15,000,000
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		25,000,000			$ 25,000,000
Hedge funds
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Unfunded commitments		0			0	0
Private equity
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Unfunded commitments		$ 0			0	3,000,000
International defined benefit pension plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Charge resulting from curtailment or settlement recorded					9,000,000	1,000,000	1,000,000
Net actuarial losses, before tax					(9,000,000)	(9,000,000)	(9,000,000)
Employer Contribution to defined benefit Plan					16,000,000	16,000,000
Net loss					$ (79,000,000)	$ (35,000,000)	$ (23,000,000)
Expected long-term rate of return on plan assets					6.96%	7.23%	7.20%
Discount rate		1.80%			1.80%	2.60%	2.43%
Fair value of plan assets		$ 500,000,000			$ 500,000,000	$ 470,000,000	$ 544,000,000
International defined benefit pension plans | Pension
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Payments for settlements			$ 21,000,000
Settlement charge released into other non-operating income (expense), net			8,000,000
Decrease from settlement	$ 37,000,000
Remeasurement due to settlement	26,000,000
Net loss	$ (11,000,000)
Expected long-term rate of return on plan assets	7.25%					0.70%
Discount rate	2.00%					3.00%
Incremental net periodic cost		5,000,000	$ 3,000,000
The UK Plan | Cash and cash equivalents | Other Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Fair value of plan assets		272,000,000			272,000,000
The UK Plan | Hedging Instruments | Other Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Fair value of plan assets		35,000,000			35,000,000
The UK Plan | Govenment Bonds | Other Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Fair value of plan assets		$ 11,000,000			$ 11,000,000