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Derivative and Other Financial Instruments (Net Investment Hedge Narrative) (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 EUR (€)	May 31, 2019 USD ($)	Nov. 30, 2018 USD ($)
Derivative [Line Items]
Gain (loss), recognized in OCI	$ 1	$ 27
Gain (loss) on net investment hedge, net of tax	1	27
Carrying amount of hedged net investment	1,359		€ 1,113
Foreign exchange
Derivative [Line Items]
Gain (loss), recognized in OCI	(48)	$ 26
Aggregate notional amount				$ 200	$ 875
Derivative fixed rate					4.75%
Net Investment Hedging | Euro notional value
Derivative [Line Items]
Derivative fixed rate					1.84%
Accumulated Other Comprehensive Loss
Derivative [Line Items]
Gain (loss), recognized in OCI	(33)
Gain (loss) on net investment hedge, net of tax	$ (10)

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Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
-Paragraph 1A
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Amount, before tax and reclassification, of gain (loss) from derivative designated and qualifying as net investment hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CCC
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Amount, after tax, of reclassification from accumulated other comprehensive income (AOCI) of gain (loss) from increase (decrease) in fair value of net investment hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CCC
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-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998896-113959

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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