Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Foreign currency translation adjustments
Beginning Balance	$ (497)	$ (441)
Comprehensive income (loss) before reclassifications	(64)	(5)
Income taxes associated with comprehensive income (loss) before reclassifications	(10)	(4)
Reclassification from accumulated other comprehensive income (loss)	0	0
Income taxes reclassified into net earnings	0	0
Ending Balance	(571)	(450)
Hedge instruments
Beginning Balance	0	0
Comprehensive income (loss) before reclassifications	(2)	0
Income taxes associated with comprehensive income (loss) before reclassifications	0	0
Reclassification from accumulated other comprehensive income (loss)	0	0
Income taxes reclassified into net earnings	0	0
Ending Balance	(2)	0
Defined benefit postretirement plans
Beginning Balance	(230)	(235)
Comprehensive income (loss) before reclassifications	6	3
Income taxes associated with comprehensive income (loss) before reclassifications	(2)	3
Reclassification from accumulated other comprehensive income (loss)	(3)	3
Income taxes reclassified into net earnings	1	(1)
Ending Balance	(228)	(227)
Other
Beginning Balance	0	2
Comprehensive income (loss) before reclassifications	0	0
Income taxes associated with comprehensive income (loss) before reclassifications	0	0
Reclassification from accumulated other comprehensive income (loss)	0	0
Income taxes reclassified into net earnings	0	0
Ending Balance	0	2
Total
Beginning Balance	(727)	(674)
Comprehensive income (loss) before reclassifications	(60)	(2)
Income taxes associated with comprehensive income (loss) before reclassifications	(12)	(1)
Reclassification from accumulated other comprehensive income (loss)	(3)	3
Income taxes reclassified into net earnings	1	(1)
Ending Balance	$ (727)	$ (674)	$ (801)	$ (675)

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

+ Details

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