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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

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- 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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- 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 + Details
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