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Pension and Other Postemployment Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amounts Recognized on the Balance Sheet:
Noncurrent liabilities	$ (2,906)	$ (3,975)
Pension
Change in benefit obligation:
Benefit obligation as of January 1	10,167	9,426
Service cost	224	208	$ 191
Interest cost	372	390	398
Plan participants’ contributions	0	0
Plan amendments	5	11
Special termination benefits	31	0
Medicare retiree drug subsidy	0	0
Annuity purchase	(129)	0
Actuarial (gain) loss	(710)	610
Benefits paid	(498)	(478)
Benefit obligation as of December 31	9,462	10,167	9,426
Change in fair value of plan assets:
Fair value of plan assets as of January 1	6,704	6,213
Actual return on plan assets	(363)	950
Annuity purchase	(129)	0
Company contributions	1,270	18
Plan participants’ contributions	0	0
Benefits paid	(498)	(477)
Fair value of plan assets as of December 31	6,984	6,704	6,213
Funded Status:
Funded Status	(2,478)	(3,463)
Accumulated benefit obligation	8,951	9,583
Amounts Recognized on the Balance Sheet:
Noncurrent assets	14	0
Current liabilities	(20)	(19)
Noncurrent liabilities	(2,472)	(3,444)
Net liability as of December 31	(2,478)	(3,463)
Amounts Recognized in AOCI:
Prior service cost (credit)	$ 30	$ 32
Assumptions Used to Determine Benefit Obligations
Discount rate	4.44%	3.75%
Rate of compensation increase	4.10%	4.20%
Cash balance weighted average interest crediting rate	3.34%	2.88%
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%
Pension | Equity securities
Allocation of Plan Assets
Asset Allocation	36.00%	42.00%
Pension | Bonds
Allocation of Plan Assets
Asset Allocation	34.00%	32.00%
Pension | Absolute return strategies
Allocation of Plan Assets
Asset Allocation	11.00%	10.00%
Pension | Real estate
Allocation of Plan Assets
Asset Allocation	10.00%	9.00%
Pension | Derivatives
Allocation of Plan Assets
Asset Allocation	2.00%	0.00%
Pension | Private equity funds
Allocation of Plan Assets
Asset Allocation	2.00%	1.00%
Pension | Cash and short-term securities
Allocation of Plan Assets
Asset Allocation	5.00%	6.00%
Pension | Pre Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed (pre/post-Medicare)	6.00%	6.00%
Pension | Post Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed (pre/post-Medicare)	5.50%	5.50%
Pension | Qualified plan
Funded Status:
Funded Status	$ (2,093)	$ (3,043)
Pension | Non-qualified plans
Funded Status:
Funded Status	(385)	(420)
OPEB
Change in benefit obligation:
Benefit obligation as of January 1	731	711
Service cost	5	5	5
Interest cost	25	27	30
Plan participants’ contributions	3	4
Plan amendments	5	0
Special termination benefits	8	0
Medicare retiree drug subsidy	1	1
Annuity purchase	0	0
Actuarial (gain) loss	(121)	32
Benefits paid	(49)	(49)
Benefit obligation as of December 31	608	731	711
Change in fair value of plan assets:
Fair value of plan assets as of January 1	439	420
Actual return on plan assets	(8)	49
Annuity purchase	0	0
Company contributions	22	16
Plan participants’ contributions	3	4
Benefits paid	(48)	(50)
Fair value of plan assets as of December 31	408	439	$ 420
Funded Status:
Funded Status	(200)	(292)
Accumulated benefit obligation	0	0
Amounts Recognized on the Balance Sheet:
Noncurrent assets	0	0
Current liabilities	0	0
Noncurrent liabilities	(200)	(292)
Net liability as of December 31	(200)	(292)
Amounts Recognized in AOCI:
Prior service cost (credit)	$ (121)	$ (206)
Assumptions Used to Determine Benefit Obligations
Discount rate	4.30%	3.50%
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	48.00%	50.00%
OPEB | Bonds
Allocation of Plan Assets
Asset Allocation	35.00%	33.00%
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 | Derivatives
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 and short-term securities
Allocation of Plan Assets
Asset Allocation	17.00%	17.00%
OPEB | Pre Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed (pre/post-Medicare)	6.00%	6.00%
OPEB | Post Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed (pre/post-Medicare)	5.50%	5.50%
OPEB | Qualified plan
Funded Status:
Funded Status	$ 0	$ 0
OPEB | Non-qualified plans
Funded Status:
Funded Status	$ 0	$ 0

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