Defined Benefit Plan, Pension Assets or Obligation, Threshold, Per Plan

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- Definition

Defined Contribution Plan, Plan Assets and Liabilities, Amount

+ References

No definition available.

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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 included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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- Definition

Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

+ References

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- Definition

Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

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- Definition

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

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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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- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

+ References

No definition available.

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- Definition

Amount of contributions made to multiemployer plan by employer.

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Employee Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended
Employee Benefit Plans - Narrative (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plan, contributions by employer	$ 3,000,000	$ 158,000,000	$ 132,000,000
Health care cost trend rate assumed next fiscal year	6.50%
Health care cost trend rate	4.50%
Defined contribution plan, employer matching contribution	5.00%
Defined contribution plan, employers matching contribution for vesting plan	4.00%
Defined contribution plans, cost	$ 235,000,000	137,000,000
Defined contribution plan, assets and liabilities	276,000,000	233,000,000
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension assets or obligations, threshold, per plan	20,000,000
Expected amortization of gain (loss), next fiscal year	(32,000,000)
Expected amortization of prior service cost (credit), next fiscal year	1,000,000
Fair values of the plan assets	3,004,000,000	1,866,000,000	2,059,000,000
Employer contributions	23,000,000	51,000,000
Estimated future employer contributions in next fiscal year	21,000,000
Pension Plan [Member] \| Fixed income and cash investment funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair values of the plan assets	1,858,000,000	937,000,000
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected amortization of gain (loss), next fiscal year	3,000,000
Expected amortization of prior service cost (credit), next fiscal year	3,000,000
Fair values of the plan assets	0	0	$ 0
Employer contributions	16,000,000	21,000,000
Estimated future employer contributions in next fiscal year	11,000,000
Fair value measured at Net Asset Value per share
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair values of the plan assets	$ 2,988,000,000	$ 1,802,000,000
Fair value measured at Net Asset Value per share \| Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percent of plan assets valued using NAV	20.00%	30.00%
Fair value measured at Net Asset Value per share \| Fixed income and cash investment funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percent of plan assets valued using NAV	62.00%	48.00%
Fair value measured at Net Asset Value per share \| Alternative investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percent of plan assets valued using NAV	18.00%	19.00%
Fair Value, Inputs, Level 1, 2 and 3 \| Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair values of the plan assets	$ 14,000,000	$ 64,000,000
Level 3 \| Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair values of the plan assets	$ 0	$ 0