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Share-based Compensation and Employee Benefits (Schedule of Changes in Plans’ Assets Included in Level 3) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of period | $ 2,296 | $ 2,160
Realized and Unrealized Gains (Losses), net | (128) | 292
Fair value of plan assets at end of period | 1,864 | 2,296
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of period | 0 |
Fair value of plan assets at end of period | 0 | 0
Pension Benefits [Member] | Guaranteed Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of period | 0 | 16
Transfers In (Out) |  | 0
Realized and Unrealized Gains (Losses), net |  | 0
Purchases (Sales), net |  | (16)
Fair value of plan assets at end of period |  | 0
OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of period | 335 | 332
Realized and Unrealized Gains (Losses), net | (5) | 29
Fair value of plan assets at end of period | 306 | 335
OPEB [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of period | 49 |
Fair value of plan assets at end of period | 51 | 49
OPEB [Member] | Guaranteed Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of period | 49 | 47
Transfers In (Out) | 0 | 0
Realized and Unrealized Gains (Losses), net | 4 | 5
Purchases (Sales), net | (2) | (3)
Fair value of plan assets at end of period | $ 51 | $ 49

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