Amount of increase (decrease) in plan assets of defined benefit plan from assets transferred into (from) plan.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

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- Definition

Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of cost for defined contribution plan.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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Defined Benefit Plan, Age Requirement

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Defined Benefit Plan, Plan Assets, Discretionary Contributions by Employer

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No definition available.

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- Definition

Defined Benefit Plan, Service Requirement

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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended			93 Months Ended
	Sep. 15, 2018	Dec. 31, 2017	Jun. 30, 2011	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company match percentage				7.00%
Contributions				$ 81	$ 82	$ 77
Employer contribution	$ 358
Discretionary contributions by employer	$ 350
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Decrease in postretirement obligations			$ 138	(4)	(16)
Postretirement benefit expense				(22)	(23)	(10)	$ 83
Transfer of liabilities				0	0
Employer contribution				$ 36	40
United States Pension Benefits \| Postretirement Health Coverage
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service requirement				10 years
Plan, age requirement				55 years
United States Pension Benefits \| Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Decrease in postretirement obligations				$ 0	0
Postretirement benefit expense				0	(8)	$ (11)
Transfer of liabilities		$ 64		0	(64)
Employer contribution				$ 380	$ 47
United States Pension Benefits \| Pension Benefits \| Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations				35.00%			35.00%
United States Pension Benefits \| Pension Benefits \| Fixed Income Funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations				65.00%			65.00%
United States Pension Benefits \| Pension Benefits \| US Large-Cap Companies
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations				50.00%			50.00%
United States Pension Benefits \| Pension Benefits \| Equity securities, international companies
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations				25.00%			25.00%
United States Pension Benefits \| Pension Benefits \| US mid and Small Cap Companies
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations				13.00%			13.00%
United States Pension Benefits \| Pension Benefits \| Venture Capital Funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations				12.00%			12.00%
United States Pension Benefits \| Pension Benefits \| Corporate Debt Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations				75.00%			75.00%
United States Pension Benefits \| Pension Benefits \| US Treasury and Government
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations				25.00%			25.00%