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Derivatives and Hedging Activities (Details Textuals) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivatives and Hedging Activities (Textuals) [Abstract] |  |  |
Net reduction in interest expense on long term debt and other | $ 133 | $ 224 | $ 284
Margin on interest rate swap not netted | 146 | 169 |
Derivative [Line Items] |  |  |
Equity investment | 48 | 49 |
Total derivatives assets, net | 124 | 555 |
Other Expense [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) in changes of Fair Value of Derivatives not designated as hedges | (29) | 1 | 83
Gain on embedded derivatives | 0 | 9 | 5
Fair Value Hedges [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of long-term debt | 23,800 | 17,700 |
Cash Flow Hedges [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of long-term debt |  | 0 |
Net Investment Hedges [Member] |  |  |
Derivative [Line Items] |  |  |
Effective portion of gain (loss) on hedges | (370) | 281 | 577
Net Investment Hedges [Member] | Other Expense [Member] |  |  |
Derivative [Line Items] |  |  |
Amount Of Ineffectiveness On Net Investment Hedges | 0 | 0 | 1
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (31) | (5) | $ 0
Credit Valuation Adjustment [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of long-term debt | 0 | 0 |
Not Sold Or Repledged [Member] |  |  |
Derivative [Line Items] |  |  |
Securities received as collateral | 0 | 18 |
Risk Exposure Low [Member] |  |  |
Derivative [Line Items] |  |  |
Total derivatives assets, net | 0 | 537 |
Significant Counterparties [Member] |  |  |
Derivative [Line Items] |  |  |
Total derivatives assets, net | 0 | $ 0 |
Total derivatives liabilities, net | $ 0 |  |

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- Definition Derivatives and Hedging Activities. + References No definition available. + Details
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- Definition Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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