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Basis of Presentation and Principles of Consolidation (ASU Update 2018-02) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Future contractual lease payment obligations |  | $ 636
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification from AOCI, tax amount | $ (142) |
Retained Earnings | Accounting Standards Update 2018-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification from AOCI, tax amount | $ 142 |

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- Definition Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect + References No definition available. + Details
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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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