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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Projected Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6522206

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accumulated Postretirement Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6503904

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 15
-Paragraph 6
-Subparagraph (a)(1)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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Employee Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2015	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure
Cash contribution to pension trusts					$ 35	$ 437
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year					100
Pension Plan
Defined Benefit Plan Disclosure
Pension settlement related charges	$ 0	$ (19)			0	(1,348)
UNITED STATES \| Before Tax
Defined Benefit Plan Disclosure
Pension settlement related charges					$ (19)	$ (1,350)
UNITED STATES \| Pension Plan
Defined Benefit Plan Disclosure
Cash contribution to pension trusts			$ 410
UNITED STATES \| Pension Plan \| After Tax
Defined Benefit Plan Disclosure
Pension settlement related charges				$ (1,000)
UNITED STATES \| Pension Plan \| Before Tax
Defined Benefit Plan Disclosure
Pension settlement related charges				(1,000)
UNITED STATES \| Group Annuity Contracts that Transferred
Defined Benefit Plan Disclosure
Defined Benefit Plan, Benefit Obligation				$ 2,500