Arrangements With Off-Balance Sheet Risk (Schedule Of Arrangements With Off-Balance Sheet Risk) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Contingent Repurchase Commitment [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	$ 1,605	$ 1,306
Estimated Proceeds from Collateral/ Recourse	1,605	1,306
Carrying Amount of Liabilities	9	9
Credit Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	109	29
Estimated Proceeds from Collateral/ Recourse	55	27
Carrying Amount of Liabilities	16	2
ULA [Member] \| Contributed Delta Program Launch Inventory [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	72	77
ULA [Member] \| Contract Pricing [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	261	261
Carrying Amount of Liabilities	7	7
ULA [Member] \| Other Delta Contracts [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	191	216
Carrying Amount of Liabilities		$ 5

Indicates, if estimable, the approximate extent to which recourse provisions or proceeds from liquidation of any assets held either as collateral or by third parties would be expected to cover the maximum potential amount of future payments under the guarantee (or each group of similar guarantees).

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

+ Details

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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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