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Fair Value Fair Value - Carrying Value and Fair Value Classified by Level (Details) - Nonrecurring - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Carrying value |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgages Held-for-sale, Fair Value Disclosure | $ 1,338 | $ 1,361
Equity Securities without Readily Determinable Fair Value, Amount | 135 | 140
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment Contracts With Fixed Maturity | 5 | 5
Investment Contracts Without A Fixed Maturity | 377 | 382
Long-term debt | 71,781 | 72,709
Estimated Fair Value | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgages Held-for-sale, Fair Value Disclosure | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment Contracts With Fixed Maturity | 0 | 0
Investment Contracts Without A Fixed Maturity | 0 | 0
Long-term debt | 72,376 | 71,252
Estimated Fair Value | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgages Held-for-sale, Fair Value Disclosure | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment Contracts With Fixed Maturity | 0 | 0
Investment Contracts Without A Fixed Maturity | 0 | 0
Long-term debt | 0 | 0
Estimated Fair Value | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgages Held-for-sale, Fair Value Disclosure | 1,350 | 1,366
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment Contracts With Fixed Maturity | 5 | 5
Investment Contracts Without A Fixed Maturity | 364 | 357
Long-term debt | 0 | 0
Estimated Fair Value | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgages Held-for-sale, Fair Value Disclosure | 1,350 | 1,366
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment Contracts With Fixed Maturity | 5 | 5
Investment Contracts Without A Fixed Maturity | 364 | 357
Long-term debt | $ 72,376 | $ 71,252

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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