Arrangements With Off-Balance Sheet Risk (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
ULA \| Deferred Support and Production Costs [Member]
Guarantees [Line Items]
Litigation Settlement, Amount Awarded from Other Party	$ 307

Amount awarded from other party in judgment or settlement of litigation.

No definition available.

Name:	us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration