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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Valuation Allowance [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  | $ 20 |  |
Effective income tax rate reconciliation [Abstract] |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | (47) | $ (117) |
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |
Tax Credit Carryforward, Valuation Allowance |  | 111 | 189 |
Effective income tax rate |  | 297 |  |
Details of income tax provision (benefit) [Abstract] |  |  |  |
Effective income tax rate |  | 297 |  |
U.S. and foreign income before income taxes [Abstract] |  |  |  |
Income from Continuing Operations Before Income Taxes |  | 1,839 | 2,274 | $ 1,345
U.S. state [Member] |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |
Tax Credit Carryforward, Valuation Allowance |  | 100 |  |
Internal Revenue Service (IRS) [Member] |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |
Tax Credit Carryforward, Valuation Allowance |  | 300 |  |
Foreign Tax Credit [Domain] |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |
Tax Credit Carryforward, Valuation Allowance |  | 100 |  |
Current Year Operations |  |  |  |
Changes in valuation allowance [Roll Forward] |  |  |  |
Valuation Allowance, Change in Amount |  | (78) |  | (14)
Changes in Judgement |  |  |  |
Changes in valuation allowance [Roll Forward] |  |  |  |
Valuation Allowance, Change in Amount |  |  |  | $ (17)
Continuing Operations [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Current |  | $ 195 | $ 139 |
Effective income tax rate reconciliation [Abstract] |  |  |  |
U.S. federal statutory rate (in hundredths) |  | 21.00% | 35.00% | 35.00%
State income tax, net of federal tax benefit (in hundredths) |  | 1.00% | 0.50% | 1.10%
Statutory rate differential attributable to foreign operations (in hundredths) |  | (12.30%) | (9.30%) | (10.50%)
Adjustments to reserves and prior years (in hundredths) |  | 2.80% | 0.50% | (0.80%)
Change in valuation allowance (in hundredths) |  | 8.50% | 1.50% | (0.20%)
Other, net (in hundredths) |  | (0.40%) | (1.10%) | (0.30%)
Effective income tax rate (in hundredths) |  | 16.20% | 41.10% | 24.30%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | [1] |  | $ (22) | $ (26)
Effective Income Tax Rate Reconciliation Share Based Compensation |  | (2.50%) | (5.10%) | 0.00%
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |
Change in valuation allowance |  | $ (156) | $ (34) | $ (3)
Effective income tax rate |  | 297 | 934 | 327
Details of income tax provision (benefit) [Abstract] |  |  |  |
Current: Federal |  | 102 | (2) | 126
Current: Foreign |  | 181 | 290 | 160
Current: State |  | 25 | 12 | 13
Total current income tax provision (benefit) |  | 308 | 300 | 299
Deferred: Federal |  | (24) | 603 | 19
Deferred: Foreign |  | 5 | 19 | 3
Deferred: State |  | 8 | 12 | 6
Total deferred income tax provision (benefit) |  | (11) | 634 | 28
Effective income tax rate |  | 297 | 934 | 327
U.S. and foreign income before income taxes [Abstract] |  |  |  |
U.S. |  | 726 | 662 | 366
Foreign |  | 1,113 | 1,612 | 979
Income from Continuing Operations Before Income Taxes |  | 1,839 | 2,274 | $ 1,345
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ 35 | $ 434 |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  | (1.90%) | 19.10% | 0.00%
Tax Year 2017 [Member] |  |  |  |
Effective income tax rate reconciliation [Abstract] |  |  |  |
U.S. federal statutory rate (in hundredths) |  |  | 35.00% |
Tax Year 2018 [Domain] |  |  |  |
Effective income tax rate reconciliation [Abstract] |  |  |  |
U.S. federal statutory rate (in hundredths) |  | 21.00% | 21.00% |
U.S. and foreign income before income taxes [Abstract] |  |  |  |
Limit on deductibility of interest expense |  |  | 30.00% |
Tax Year 2018 [Member] | Continuing Operations [Member] |  |  |  |
U.S. and foreign income before income taxes [Abstract] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ 399 |  |
Repatriation Tax Liability [Member] |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |
Effective income tax rate |  | 241 |  |
Details of income tax provision (benefit) [Abstract] |  |  |  |
Effective income tax rate |  | 241 |  |
Remeasurement of Deferreds [Domain] |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |
Effective income tax rate |  | 47 |  |
Details of income tax provision (benefit) [Abstract] |  |  |  |
Effective income tax rate |  | $ 47 |  |
Prior Year Divestiture [Member] | Continuing Operations [Member] |  |  |  |
Effective income tax rate reconciliation [Abstract] |  |  |  |
Adjustments to reserves and prior years (in hundredths) |  | 1900000000.00% |  |
[1] | Deferred tax benefit recognized does not reflect the impact of the Tax Act. See Note 17.

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