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Pension and Other Postemployment Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amounts Recognized on the Balance Sheet:
Noncurrent liabilities	$ (3,719)	$ (4,245)
Pension
Change in benefit obligation:
Benefit obligation as of January 1	9,079	9,249
Service cost	191	193	$ 167
Interest cost	398	383	402
Plan participants' contributions	0	0
Plan amendments	0	0
Medicare retiree drug subsidy	0	0
Actuarial (gain) loss	224	(277)
Benefits paid	(466)	(469)
Benefit obligation as of December 31	9,426	9,079	9,249
Change in fair value of plan assets:
Fair value of plan assets as of January 1	5,338	5,824
Actual return (losses) on plan assets	442	(178)
Company contributions	899	161
Plan participants' contributions	0	0
Benefits paid	(466)	(469)
Fair value of plan assets as of December 31	6,213	5,338	5,824
Funded Status:
Funded Status	(3,213)	(3,741)
Accumulated benefit obligation	8,913	8,579
Amounts Recognized on the Balance Sheet:
Noncurrent assets	9	0
Current liabilities	(19)	(18)
Noncurrent liabilities	(3,203)	(3,723)
Net liability as of December 31	(3,213)	(3,741)
Amounts Recognized in AOCI:
Prior service cost (credit)	$ 28	$ 37
Assumptions Used to Determine Benefit Obligations
Discount rate	4.25%	4.50%
Rate of compensation increase	4.20%	4.20%
Allocation of Plan Assets
Asset Allocation	100.00%	100.00%
Pension | Equity securities
Allocation of Plan Assets
Asset Allocation	44.00%	40.00%
Pension | Bonds
Allocation of Plan Assets
Asset Allocation	30.00%	34.00%
Pension | Absolute return strategies
Allocation of Plan Assets
Asset Allocation	8.00%	7.00%
Pension | Real estate
Allocation of Plan Assets
Asset Allocation	10.00%	11.00%
Pension | Private equity funds
Allocation of Plan Assets
Asset Allocation	0.00%	0.00%
Pension | Cash
Allocation of Plan Assets
Asset Allocation	8.00%	8.00%
Pension | Qualified plan
Funded Status:
Funded Status	$ (2,821)	$ (3,366)
Pension | Non-qualified plans
Funded Status:
Funded Status	(392)	(375)
OPEB
Change in benefit obligation:
Benefit obligation as of January 1	724	757
Service cost	5	5	9
Interest cost	30	29	39
Plan participants' contributions	5	6
Plan amendments	(13)	(10)
Medicare retiree drug subsidy	1	1
Actuarial (gain) loss	14	(2)
Benefits paid	(55)	(62)
Benefit obligation as of December 31	711	724	757
Change in fair value of plan assets:
Fair value of plan assets as of January 1	431	464
Actual return (losses) on plan assets	30	6
Company contributions	9	17
Plan participants' contributions	5	6
Benefits paid	(55)	(62)
Fair value of plan assets as of December 31	420	431	$ 464
Funded Status:
Funded Status	(291)	(293)
Accumulated benefit obligation	0	0
Amounts Recognized on the Balance Sheet:
Noncurrent assets	0	0
Current liabilities	0	0
Noncurrent liabilities	(291)	(293)
Net liability as of December 31	(291)	(293)
Amounts Recognized in AOCI:
Prior service cost (credit)	$ (288)	$ (355)
Assumptions Used to Determine Benefit Obligations
Discount rate	4.00%	4.25%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Allocation of Plan Assets
Asset Allocation	100.00%	100.00%
OPEB | Equity securities
Allocation of Plan Assets
Asset Allocation	53.00%	51.00%
OPEB | Bonds
Allocation of Plan Assets
Asset Allocation	41.00%	43.00%
OPEB | Absolute return strategies
Allocation of Plan Assets
Asset Allocation	0.00%	0.00%
OPEB | Real estate
Allocation of Plan Assets
Asset Allocation	0.00%	0.00%
OPEB | Private equity funds
Allocation of Plan Assets
Asset Allocation	0.00%	0.00%
OPEB | Cash
Allocation of Plan Assets
Asset Allocation	6.00%	6.00%
OPEB | Pre Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed	6.00%	6.00%
OPEB | Post Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed	5.50%	5.50%

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Defined Benefit Plan, Assets, Actual Allocations [Abstract]

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contributions made by the employer to defined benefit plans.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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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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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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The ultimate trend rate for health care costs.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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