Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract]
Cumulative Effect of New Accounting Principle in Period of Adoption							$ (14)
Foreign currency translation adjustments
Beginning Balance	$ (463)	$ (375)	$ (441)	$ (294)
Comprehensive income (loss) before reclassifications	(107)	(45)	(127)	(132)
Income taxes associated with comprehensive income (loss) before reclassifications	(7)	2	(9)	8
Reclassification from accumulated other comprehensive income (loss)	0	0	0	0
Income taxes reclassified into net earnings	0	0	0	0
Ending Balance	(577)	(418)	(577)	(418)
Hedge instruments
Beginning Balance	(1)	(3)	0	(1)
Comprehensive income (loss) before reclassifications	0	2	(1)	(4)
Income taxes associated with comprehensive income (loss) before reclassifications	0	0	0	1
Reclassification from accumulated other comprehensive income (loss)	1	0	1	4
Income taxes reclassified into net earnings	0	0	0	(1)
Ending Balance	0	(1)	0	(1)
Defined benefit postretirement plans
Beginning Balance	(208)	(207)	(235)	(198)
Comprehensive income (loss) before reclassifications	3	(1)	7	1
Income taxes associated with comprehensive income (loss) before reclassifications	(1)	0	(2)	0
Reclassification from accumulated other comprehensive income (loss)	3	2	34	6
Income taxes reclassified into net earnings	(1)	(1)	(8)	(2)
Ending Balance	(204)	(207)	(204)	(207)
Other
Beginning Balance	2	3	2	3
Comprehensive income (loss) before reclassifications	0	0	0	0
Income taxes associated with comprehensive income (loss) before reclassifications	0	0	0	0
Reclassification from accumulated other comprehensive income (loss)	0	0	0	0
Income taxes reclassified into net earnings	0	0	0	0
Ending Balance	2	3	2	3
Total
Beginning Balance	(670)	(582)	(674)	(490)
Comprehensive income (loss) before reclassifications	(104)	(44)	(121)	(135)
Income taxes associated with comprehensive income (loss) before reclassifications	(8)	2	(11)	9
Reclassification from accumulated other comprehensive income (loss)	4	2	35	10
Income taxes reclassified into net earnings	(1)	(1)	(8)	(3)
Ending Balance	$ (670)	$ (582)	$ (674)	$ (490)	$ (779)	$ (623)

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Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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- Definition

Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net period benefit cost (credit) of defined benefit plan.

+ References

+ Details

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- Definition

Amount of tax (expense) benefit for reclassification adjustment from accumulated other comprehensive (income) loss of defined benefit plan.

+ References

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Amount before tax of 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

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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
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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

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