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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Summary of Significant Accounting Policies (Textuals) [Abstract]
Cash and cash equivalents	$ 1,152	$ 703
Operating lease ROU assets	564
Operating lease liability	$ 595
Purchase of common shares (in shares)	1	1	4
ASU 2016-02
Summary of Significant Accounting Policies (Textuals) [Abstract]
Operating lease ROU assets				$ 442
Operating lease liability				$ 446
Buildings
Summary of Significant Accounting Policies (Textuals) [Abstract]
Fixed asset, estimated useful life	30 years
Minimum
Summary of Significant Accounting Policies (Textuals) [Abstract]
Lease renewal term	1 year
Minimum | Furniture and fixture
Summary of Significant Accounting Policies (Textuals) [Abstract]
Fixed asset, estimated useful life	3 years
Minimum | Computer equipment
Summary of Significant Accounting Policies (Textuals) [Abstract]
Fixed asset, estimated useful life	3 years
Maximum
Summary of Significant Accounting Policies (Textuals) [Abstract]
Lease renewal term	5 years
Maximum | Furniture and fixture
Summary of Significant Accounting Policies (Textuals) [Abstract]
Fixed asset, estimated useful life	7 years
Maximum | Computer equipment
Summary of Significant Accounting Policies (Textuals) [Abstract]
Fixed asset, estimated useful life	7 years
Customer relationships
Summary of Significant Accounting Policies (Textuals) [Abstract]
Intangible assets, estimated useful lives	10 years
Trademarks | Maximum
Summary of Significant Accounting Policies (Textuals) [Abstract]
Intangible assets, estimated useful lives	5 years
Software | Minimum
Summary of Significant Accounting Policies (Textuals) [Abstract]
Intangible assets, estimated useful lives	3 years
Software | Maximum
Summary of Significant Accounting Policies (Textuals) [Abstract]
Intangible assets, estimated useful lives	10 years
Internally developed software | Minimum
Summary of Significant Accounting Policies (Textuals) [Abstract]
Intangible assets, estimated useful lives	3 years
Internally developed software | Maximum
Summary of Significant Accounting Policies (Textuals) [Abstract]
Intangible assets, estimated useful lives	10 years

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