Postretirement Benefit Plans (Details Textual) - USD ($) shares in Thousands			3 Months Ended				12 Months Ended
	Jan. 27, 2020	Jul. 31, 2019	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2020	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							267	302
Charge resulting from curtailment or settlement recorded							$ 0	$ 9,000,000	$ 1,000,000
Prior service credit							(6,000,000)	(4,000,000)
Accumulated benefit obligation							$ 1,107,000,000	919,000,000
Expected long-term return on plan assets							3.24%
Estimated pension plan contributions during the next fiscal quarter							$ 6,000,000
Payments for settlements							5,000,000
Net loss							$ (78,000,000)	$ (83,000,000)	$ (37,000,000)
Expected long-term rate of return on plan assets			1.00%				3.46%	7.09%	7.34%
Fair value of plan assets							$ 691,000,000	$ 605,000,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan	$ 336,000,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Change Due to Subsequent Interim Measurement, Weighted-Average Expected Long-term Rate of Return on Plan Assets									0.70%	7.25%
Discount rate									2.00%	3.00%
Defined Benefit Plan, Incremental Net Periodic Benefit Cost (Expense)					$ 5,000,000	$ 3,000,000
Pension
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Prior service credit							3,000,000	3,000,000
Employer Contribution to defined benefit Plan							27,000,000
Fair value of plan assets							691,000,000	605,000,000
Other Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Prior service credit							(9,000,000)	(7,000,000)
Net actuarial losses, before tax							(2,000,000)	(2,000,000)	$ (2,000,000)
Prior service credit, before tax							(3,000,000)	(4,000,000)	(4,000,000)
Employer Contribution to defined benefit Plan								19,000,000
Net loss							(1,000,000)	2,000,000	(1,000,000)
Fair value of plan assets							$ 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							$ 19,000,000
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							$ 27,000,000
Cash and cash equivalents
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Fair value of plan assets							4,000,000	273,000,000
Hedge funds
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Unfunded commitments							0	0
Fair value of plan assets							1,000,000	12,000,000
International defined benefit pension plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Charge resulting from curtailment or settlement recorded							0	9,000,000	1,000,000
Net actuarial losses, before tax							(14,000,000)	(9,000,000)	(9,000,000)
Employer Contribution to defined benefit Plan							24,000,000	16,000,000
Net loss							$ (74,000,000)	$ (79,000,000)	$ (35,000,000)
Expected long-term rate of return on plan assets							2.82%	6.96%	7.23%
Discount rate					2.60%		1.06%	1.80%	2.60%
Fair value of plan assets					$ 470,000,000		$ 578,000,000	$ 500,000,000	$ 470,000,000
Discount rate							1.80%	2.60%	2.43%
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