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Risk Management - FV Hedging Effect on Income Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Cumulative amount of fair value hedging adjustments to hedged fixed rate debt	$ 359	$ 2
Designated as Hedging Instrument | Fair Value Hedging | Hedged Fixed Rate Debt
Derivative [Line Items]
Cumulative amount of fair value hedging adjustments to hedged fixed rate debt	359
Designated as Hedging Instrument | Fair Value Hedging | Interest Expense | Interest Rate Contract
Derivative [Line Items]
Gain/(loss) recognized in income on derivatives and related hedged item	340	(122)	$ (103)
Designated as Hedging Instrument | Fair Value Hedging | Interest Expense | Hedged Fixed Rate Debt
Derivative [Line Items]
Gain/(loss) recognized in income on derivatives and related hedged item	$ (353)	$ 113	$ 105

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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+ References

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- Definition

Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959

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