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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
	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)

X

- Definition

Defined Benefit Plan, Effect Of One-Percentage Point Decrease In Assumed Health Care Cost Trend Rate

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- Definition

Defined Benefit Plan, Effect Of One-Percentage Point Increase In Assumed Health Care Cost Trend Rate

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.

+ References

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Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate.

+ References

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-SubTopic 20
-Section 50
-Paragraph 1
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