Arrangements With Off-Balance Sheet Risk (Schedule Of Arrangements With Off-Balance Sheet Risk) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Contingent Repurchase Commitment [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	$ 1,452	$ 1,570
Estimated Proceeds from Collateral/ Recourse	1,452	1,570
Credit Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	90	92
Estimated Proceeds from Collateral/ Recourse	28	36
Carrying Amount of Liabilities	24	16
ULA [Member] \| Contributed Delta Program Launch Inventory [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	15	30
ULA [Member] \| Contract Pricing [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	$ 17	34
ULA [Member] \| Other Delta Contracts [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments		317
Carrying Amount of Liabilities		$ 48

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
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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248

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- Details

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- Details

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- Details

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