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Summary of Significant Accounting Policies (Recent Accounting and Reporting Pronouncements Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Jan. 01, 2018 | Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassified premiums paid from net cash used for operating activities | $ 0 | $ 0 | $ 22 |  |  |
Reclass from net cash used in operating activities | (571) | 251 | 134 |  |  |
Net cash used in financing activities | (3,533) | 400 | 638 |  |  |
Net cash provided by investing activities | (3,843) | 496 | 633 |  |  |
Beneficial interest obtained in securitized receivables | $ 456 | 1,047 | 1,032 |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | $ 10 | $ 60
ASU 2016-15 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassified premiums paid from net cash used for operating activities |  |  | (22) |  |  |
Reclass from net cash used in operating activities |  | 1,010 | 1,086 |  |  |
Net cash used in financing activities |  |  | (22) |  |  |
Net cash provided by investing activities |  | $ 1,010 | $ 1,086 |  |  |
Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 6 | $ 60
Retained Earnings | ASU 2017-12 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | $ (3) |
Scenario, Forecast | ASU 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease, liability |  |  |  | $ 225 |  |

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- Definition Amount of beneficial interest received as consideration for transferring noncash financial asset. Includes, but is not limited to, trade receivable in securitization transaction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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