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

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Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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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.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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Amount of cost for defined contribution plan.

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Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Lump sum payment	$ 277
One-time settlement charge relating to lump sum distributions		$ 81
Amounts charged to expense for defined contribution plans		83	$ 93	$ 85
Employer contributions	270
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	8,200	8,200	8,000
Projected benefit obligation	413	413
Accumulated benefit obligation	364	364
Fair value of plan assets	124	124
Employer contributions		24	531
Fair value of plan assets, net	8,015	$ 8,015	$ 7,475	$ 6,706
Expected rate of return on plan assets		8.00%	8.00%	8.00%
Pension [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets		7.80%
Pension [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution to its pension plans	$ 60	$ 60
Expected rate of return on plan assets		8.00%
Pension [Member] \| Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	3.00%	3.00%
Pension [Member] \| Below grade investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	7.00%	7.00%
Pension [Member] \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	55.00%	55.00%
Composition of plan assets	59.00%	59.00%
Pension [Member] \| Equity Securities [Member] \| Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	4.00%	4.00%
Pension [Member] \| Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	45.00%	45.00%
Pension [Member] \| Fixed Income Securities [Member] \| Below grade investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	16.00%	16.00%
Pension [Member] \| Corporate Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	30.00%	30.00%
Pension [Member] \| US Treasury And Foreign Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	11.00%	11.00%
Pension [Member] \| Change in Assumptions for Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease in pre-tax net periodic benefit cost			$ 70
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution amount	$ 270
Employer contributions		$ 270	0
Expected future employer contributions	70	70
Fair value of plan assets, net	$ 270	$ 270	$ 0	$ 0
Expected rate of return on plan assets		0.00%	0.00%	0.00%
Postretirement Benefit Plan [Member] \| Equity Securities [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	55.00%	55.00%
Postretirement Benefit Plan [Member] \| Equity Securities [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	45.00%	45.00%
Postretirement Benefit Plan [Member] \| Common/Collective Trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 150	$ 150
Postretirement Benefit Plan [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, net	$ 120	$ 120
Postretirement Benefit Plan [Member] \| Change in Assumptions for Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease in pre-tax net periodic benefit cost			$ 20
Scenario, Plan [Member] \| Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets		7.80%