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Derivatives and Hedging Activities (Details Textuals) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |
Derivative asset not offset | $ 0 |  | $ 0 |  | $ 0
Derivative liabilities not offset | 0 |  | 0 |  | 0
Margin on interest rate swaps | 76,000,000 |  | 76,000,000 |  | 84,000,000
Cumulative amount of fair value hedging adjustment | 199,000,000 |  | 199,000,000 |  | (241,000,000)
Net increase (reduction) in interest expense on long term debt and other | 36,000,000 | $ 13,000,000 | 74,000,000 | $ (1,000,000) |
Other Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss) in changes in fair value of derivatives not designated as hedges | 23,000,000 | 55,000,000 | 27,000,000 | 34,000,000 |
Changes in fair value of an embedded derivative |  | 4,000,000 |  | 6,000,000 |
Fair Value Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of long-term debt | 22,100,000,000 |  | 22,100,000,000 |  | 24,000,000,000.0
Net Investment Hedges [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amounts of derivatives | 9,700,000,000 |  | 9,700,000,000 |  | 9,600,000,000
Reported Value Measurement [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of long-term debt | 22,200,000,000 |  | 22,200,000,000 |  | $ 23,700,000,000
AOCI Attributable to Parent [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss) on net investment hedges, net of taxes | $ 87,000,000 | $ 320,000,000 | $ (75,000,000) | $ 158,000,000 |

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- Definition Cumulative FV hedging adjustments + References No definition available. + Details
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- Definition Fair value of derivative assets that are permitted under a master netting arrangement, but elected not to be presented as an offset against an obligation to return collateral received against such assets. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: 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=109980867&loc=SL5580258-113959 Reference 3: 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=109980867&loc=SL5579245-113959 + Details
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