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Share-based Compensation and Employee Benefits (Pensions and Other Postretirement Benefit Plans - Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Components of Accumulated Other Comprehensive Income/Loss |  |  |
Expected amortization in next year | $ 40 |  |
Expected amortization in next year, unrecognized net actuarial loss | (42) |  |
Expected amortization in next year, unrecognized prior service (credit) | $ (2) |  |
Pension Benefits [Member] |  |  |
Pension Plans and OPEB |  |  |
Percentage of employees covered | 100.00% |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 27 | $ 39 | $ 10
Components of Accumulated Other Comprehensive Income/Loss |  |  |
Accumulated benefit obligation | 2,535 | 2,840 |
Expected Payment of Future Benefits and Employer Contributions |  |  |
Expected employer contributions in next year | $ 60 |  |
Pension Benefits [Member] | Minimum [Member] | Equity Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 34.00% |  |
Pension Benefits [Member] | Minimum [Member] | Fixed Income Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 37.00% |  |
Pension Benefits [Member] | Minimum [Member] | Cash [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 0.00% |  |
Pension Benefits [Member] | Minimum [Member] | Alternative Investments [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 0.00% |  |
Pension Benefits [Member] | Minimum [Member] | Company Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 0.00% |  |
Pension Benefits [Member] | Maximum [Member] | Equity Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 59.00% |  |
Pension Benefits [Member] | Maximum [Member] | Fixed Income Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 57.00% |  |
Pension Benefits [Member] | Maximum [Member] | Cash [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 5.00% |  |
Pension Benefits [Member] | Maximum [Member] | Alternative Investments [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 2.00% |  |
Pension Benefits [Member] | Maximum [Member] | Company Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 10.00% |  |
Pension Benefits [Member] | U.S. |  |  |
Pension Plans and OPEB |  |  |
Vesting period | 3 years |  |
OPEB [Member] |  |  |
Pension Plans and OPEB |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ (17) | (14) | (5)
Components of Accumulated Other Comprehensive Income/Loss |  |  |
Accumulated benefit obligation whose accumulated benefit obligations exceeded the fair value of plan assets | 293 | 373 |
Accumulated benefit obligation whose accumulated benefit obligations exceeded the fair value of plan assets, fair value of plan assets | 70 | 84 |
Expected Payment of Future Benefits and Employer Contributions |  |  |
Expected employer contributions in next year | $ 7 |  |
Actuarial Assumptions and Sensitivity Analysis |  |  |
Weighted-average annual rate of increase in the per capita cost of covered health care benefits | 7.26% |  |
Ultimate health care cost trend rate | 4.54% |  |
OPEB [Member] | Minimum [Member] | Equity Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 42.00% |  |
OPEB [Member] | Minimum [Member] | Fixed Income Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 25.00% |  |
OPEB [Member] | Minimum [Member] | Cash [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 0.00% |  |
OPEB [Member] | Maximum [Member] | Equity Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 67.00% |  |
OPEB [Member] | Maximum [Member] | Fixed Income Securities [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 51.00% |  |
OPEB [Member] | Maximum [Member] | Cash [Member] |  |  |
Plan Assets |  |  |
Target allocation percentage | 20.00% |  |
OPEB [Member] | U.S. |  |  |
Other Postretirement Benefit Plans |  |  |
Medicare participation, age | 65 |  |
Savings plan - defined contribution plan [Member] |  |  |
Savings Plan |  |  |
Percentage of eligible compensation contributed | 5.00% |  |
Plan cost | $ 48 | $ 47 | $ 47

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