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Risk Management - Interest Rate Risk Management (Details) $ in Millions	Dec. 31, 2020 USD ($)
Fair Value Hedging | Fixed-To-Variable Interest Rate Contracts [Member] | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	$ 7,625
Fair Value Hedging | Floating-To-Fixed Interest Rate Contracts [Member] | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	2,500
Cash Flow Hedging | Floating-To-Fixed Interest Rate Contracts [Member] | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	250
Current Portion of Debt | Fixed-To-Variable Interest Rate Contracts [Member]
Derivative [Line Items]
Principal amount of hedged senior notes	900
Long-term Debt | Fixed-To-Variable Interest Rate Contracts [Member]
Derivative [Line Items]
Principal amount of hedged senior notes	$ 6,725

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- Definition

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

+ References

No definition available.

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- Definition

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+ References

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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