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Hedging Activities (Narrative) (Details) $ in Millions | Dec. 31, 2018 USD ($) | Oct. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 31, 2012 USD ($) item
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Derivative Asset, Notional Amount | $ 14,911 |  | $ 15,718 |
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative Asset, Notional Amount |  | $ 16 |  |
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] |  |  |  |
Amount expected to be reclassified into earnings within the next 12 months | 2 |  |  |
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative Asset, Notional Amount |  |  | $ 550 |
Interest Rate Contracts [Member] | Fair Value Hedging [Member] |  |  |  |
Number of Interest Rate Derivatives Held | item |  |  |  | 2
Derivative Asset, Notional Amount |  |  |  | $ 550
Gross Notional Value, Collar Options [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative, Notional Amount | 2,000 |  |  |
Gross Notional Value Zero-Cost Collars Options [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative, Notional Amount | 9,100 |  |  |
Gross Notional Value Purchased Put Or Call Options [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative, Notional Amount | $ 2,600 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + 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 (d) -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 (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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