Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
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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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Amount of contributions made by the employer to defined benefit plans.

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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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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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Narrative that provides an understanding of significant concentrations of risk within plan assets.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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The amount of the cost recognized during the period for defined contribution plans.

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Employee Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2028	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate			2028
Defined Contribution Plan, Cost Recognized			$ 128	$ 126	$ 107
Scenario, Forecast
Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Ultimate Fiscal Year	4.60%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year		6.00%
Group Annuity Contracts that Transferred \| UNITED STATES
Defined Benefit Plan, Benefit Obligation						$ 2,500
Defined Benefit Pension Plans
Defined Benefit Plan, Benefit Obligation			4,296	4,126	3,959
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements			(7)	(1)	$ (1,357)
Cash contribution to pension trusts			$ 53	$ 108
Weighted-average expected long-term rate or return			4.46%	4.84%	5.21%
Defined Benefit Pension Plans \| Scenario, Forecast
Weighted-average expected long-term rate or return		4.54%
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year		$ 100
Defined Benefit Pension Plans \| UNITED STATES
Cash contribution to pension trusts					$ 410
Principal Plans
Defined Benefit Plan, Benefit Obligation			$ 3,567	$ 3,427
Weighted-average expected long-term rate or return			4.72%	5.10%	5.35%
Defined Benefit Plan, Significant Concentrations of Risk			there were no significant concentrations of equity or debt securities in any single issuer or industry.
Principal Plans \| Scenario, Forecast
Weighted-average expected long-term rate or return		4.81%
Fixed Income Funds \| Principal Plans \| Scenario, Forecast
Defined Benefit Plan, Target Plan Asset Allocations		70.00%
Equity Securities \| Principal Plans \| Scenario, Forecast
Defined Benefit Plan, Target Plan Asset Allocations		30.00%
Treasury Futures \| U.S. Pension Plan
Derivative, Notional Amount			$ 138	$ 216
After Tax \| Defined Benefit Pension Plans \| UNITED STATES
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements					$ (800)
Before Tax \| Defined Benefit Pension Plans \| UNITED STATES
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements					$ (1,400)