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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items] |  |
Operating lease right-of-use assets | $ 294 |
Operating lease liabilities | 311 |
ASU 2016-02 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Operating lease right-of-use assets |  | $ 333
Operating lease liabilities |  | $ 349
Office Space [Member] | ASU 2016-02 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Operating lease right-of-use assets | $ (16) |
Maximum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Intangible assets, useful life | 20 years |
Long-lived asset estimated remaining useful life | 25 years |
Maximum [Member] | Equipment and Buildings [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful Life | 25 years |
Maximum [Member] | Software Development [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful Life | 7 years |
Minimum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Intangible assets, useful life | 5 years |
Long-lived asset estimated remaining useful life | 2 years |
Minimum [Member] | Equipment and Buildings [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful Life | 15 years |
Minimum [Member] | Software Development [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful Life | 5 years |
Consolidated Subsidiaries [Member] | Maximum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Voting stock ownership percentage | 50.00% |
Consolidated Subsidiaries [Member] | Minimum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Voting stock ownership percentage | 20.00% |
Consolidated Subsidiaries [Member] | Outside Shareholders [Member] | Maximum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Non controlling interests, ownership percentage by parent | 100.00% |

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