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Share-based Compensation and Employee Benefits (Schedule of One-Percentage Point Change in Assumed Health Care Cost Trends) (Details) - OPEB [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
One-percentage point increase: |  |
Aggregate of service cost and interest cost | $ 1 | $ 1
Accumulated postretirement benefit obligation | 16 | 22
One-percentage point decrease: |  |
Aggregate of service cost and interest cost | (1) | (1)
Accumulated postretirement benefit obligation | $ (14) | $ (19)

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- Definition Defined Benefit Plan, Effect Of One-Percentage Point Decrease In Assumed Health Care Cost Trend Rate + References No definition available. + Details
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- Definition Defined Benefit Plan, Effect Of One-Percentage Point Increase In Assumed Health Care Cost Trend Rate + References No definition available. + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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