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Income Taxes (Details 6) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Tax Act Enactment [Line Items] |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 30 | $ 31 |  |
Foreign Earnings Repatriated | $ 3,900 |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  |  | $ 20 |
Effective Income Tax Rate Reconciliation Adjustments To Reserves And Prior Years | (1.70%) | 2.30% | 2.80% |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ 11 | $ 34 |  |
Employee Service Share-based Compensation, Deferred Tax Benefit from Compensation Expense | 35 | 49 | $ 44 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 22 |  |  |
Tax Credit Carryforward, Valuation Allowance |  |  | 111 |
Deferred Tax Assets, Gross | 1,636 | 1,505 |  |
Deferred Tax Assets, Net | 553 | 447 |  |
Deferred Tax Assets, Tax Deferred Expense | $ 847 | $ 718 |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  | $ 35 | $ 434
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00% | 21.00%
Limit on deductibility of interest expense |  |  |  | 30.00%
Income tax provision | $ 116 | $ 79 | $ 297 |
Unrecognized Tax Benefits | $ 175 | 188 | 113 |
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount |  |  | 241 |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount |  |  | 47 |
Deferred Compensation, Share-based Payments [Member] |  |  |  |
Tax Act Enactment [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | 18 |  |
Prior Year Divestiture [Member] |  |  |  |
Tax Act Enactment [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  |  | 19 |
Tax Year 2018 [Member] |  |  |  |
Tax Act Enactment [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  | $ 399 |
Tax Year 2017 [Member] |  |  |  |
Tax Act Enactment [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00%
Non-UK [Member] |  |  |  |
Tax Act Enactment [Line Items] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 7 |  |
Deferred Tax Assets, Gross |  | 13 |  |
Deferred Tax Assets, Net |  | 6 |  |
UNITED KINGDOM |  |  |  |
Tax Act Enactment [Line Items] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 366 |  |
Deferred Tax Assets, Gross |  | 586 |  |
Deferred Tax Assets, Tax Deferred Expense |  | $ 220 |  |

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