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Risk Management FV Hedging Effect on Income Statements Location (Details) - Designated as Hedging Instrument [Member] - Fair Value Hedging [Member] - Interest Expense [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Rate Contract
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (122)	$ (103)	$ (180)
Hedged Fixed Rate Debt
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 113	$ 105	$ 160

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

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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- Details

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- Details

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