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Share-based Compensation and Employee Benefits (Schedule of Components of Net Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Benefits [Member] |  |  |
Components of net benefit cost: |  |  |
Service cost | $ 52 | $ 40 | $ 36
Interest cost | 84 | 88 | 89
Expected return on assets | (149) | (147) | (151)
Amortization of prior service cost (credit) | 0 | 1 | 1
Amortization of net actuarial loss (gain) | 40 | 52 | 35
Curtailment and settlement loss | 0 | 5 | 0
Net benefit (credit) cost | 27 | 39 | 10
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |
Net loss (gain) arising during period | 105 | 17 | 116
Prior service cost (credit) arising during period | 0 | 0 | 0
Amortization or settlement recognition of net actuarial (loss) gain | (87) | (64) | (34)
Amortization of prior service (cost) credit | (1) | (1) | 0
Exchange rate changes | 0 | 0 | 1
Total recognized in total other comprehensive (income) loss | 17 | (48) | 83
Total recognized in net benefit cost (credit) and other comprehensive (income) loss | 44 | (9) | 93
OPEB [Member] |  |  |
Components of net benefit cost: |  |  |
Service cost | 1 | 1 | 1
Interest cost | 12 | 13 | 16
Expected return on assets | (20) | (19) | (19)
Amortization of prior service cost (credit) | (4) | (3) | (3)
Amortization of net actuarial loss (gain) | (6) | (6) | 0
Curtailment and settlement loss | 0 | 0 | 0
Net benefit (credit) cost | (17) | (14) | (5)
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |
Net loss (gain) arising during period | (32) | (25) | (48)
Prior service cost (credit) arising during period | 0 | 0 | 0
Amortization or settlement recognition of net actuarial (loss) gain | 3 | 6 | 0
Amortization of prior service (cost) credit | 3 | 1 | 1
Exchange rate changes | 0 | 0 | 0
Total recognized in total other comprehensive (income) loss | (26) | (18) | (47)
Total recognized in net benefit cost (credit) and other comprehensive (income) loss | (43) | (32) | $ (52)
OPEB [Member] | Other Affiliates [Member] |  |  |
Components of net benefit cost: |  |  |
Net benefit (credit) cost | $ (4) | $ (4) |

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