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Segment Information (Reconciliation of Depreciation and Amortization from Segment to Consolidated) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | $ 589 | $ 609 | $ 574
Americas [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 381 | 434 | 368
Canada Segment Reporting Information [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 24 | 20 | 22
EMEA [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 47 | 57 | 45
Asia Pacific [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 114 | 76 | 117
Corporate And Other Segment Reporting Information [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 23 | 22 | 22
Life Insurance Product Line [Member] | Americas [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 291 | 291 | 273
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 24 | 20 | 22
Life Insurance Product Line [Member] | EMEA [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 46 | 56 | 45
Life Insurance Product Line [Member] | Asia Pacific [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 94 | 60 | 115
Insurance, Other [Member] | Americas [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 90 | 143 | 95
Insurance, Other [Member] | Canada Segment Reporting Information [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 0 | 0 | 0
Insurance, Other [Member] | EMEA [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 1 | 1 | 0
Insurance, Other [Member] | Asia Pacific [Member] |  |  |
Depreciation, Depletion and Amortization [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | $ 20 | $ 16 | $ 2

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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