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Fair Value Fair Value - Measurement on a recurring basis (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
US Government Agencies Debt Securities [Member] |  |
Available-for-sale Securities, Fair Value | $ 1,744 | $ 1,688
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale Securities, Fair Value | 2,317 | 2,399
Debt Security, Corporate, US [Member] |  |
Available-for-sale Securities, Fair Value | 7,064 | 6,489
Debt Security, Corporate, Non-US [Member] |  |
Available-for-sale Securities, Fair Value | 2,353 | 2,383
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Fair Value | 595 | 577
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Fair Value | 637 | 605
Other Asset-Backed Securities [Member] |  |
Available-for-sale Securities, Fair Value | 1,149 | 1,085
Redeemable Preferred Stock [Member] |  |
Available-for-sale Securities, Fair Value | 38 | 29
Debt Securities [Member] |  |
Available-for-sale Securities, Fair Value | 15,897 | 15,255
Recurring |  |
Assets, Fair Value Disclosure | 15,977 | 15,328
Recurring | Level 1 |  |
Assets, Fair Value Disclosure | 1,674 | 1,616
Recurring | Level 2 |  |
Assets, Fair Value Disclosure | 14,160 | 13,581
Recurring | Level 3 |  |
Assets, Fair Value Disclosure | 143 | 131
Recurring | US Government Agencies Debt Securities [Member] |  |
Available-for-sale Securities, Fair Value | 1,744 | 1,688
Recurring | US Government Agencies Debt Securities [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 1,665 | 1,597
Recurring | US Government Agencies Debt Securities [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 79 | 91
Recurring | US Government Agencies Debt Securities [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale Securities, Fair Value | 2,317 | 2,399
Recurring | US States and Political Subdivisions Debt Securities [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | US States and Political Subdivisions Debt Securities [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 2,317 | 2,399
Recurring | US States and Political Subdivisions Debt Securities [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Debt Security, Corporate, US [Member] |  |
Available-for-sale Securities, Fair Value | 7,064 | 6,489
Recurring | Debt Security, Corporate, US [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Debt Security, Corporate, US [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 7,006 | 6,422
Recurring | Debt Security, Corporate, US [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | 58 | 67
Recurring | Debt Security, Corporate, Non-US [Member] |  |
Available-for-sale Securities, Fair Value | 2,353 | 2,383
Recurring | Debt Security, Corporate, Non-US [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Debt Security, Corporate, Non-US [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 2,350 | 2,380
Recurring | Debt Security, Corporate, Non-US [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | 3 | 3
Recurring | Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Fair Value | 595 | 577
Recurring | Residential Mortgage Backed Securities [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Residential Mortgage Backed Securities [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 595 | 577
Recurring | Residential Mortgage Backed Securities [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Fair Value | 637 | 605
Recurring | Commercial Mortgage Backed Securities [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Commercial Mortgage Backed Securities [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 637 | 605
Recurring | Commercial Mortgage Backed Securities [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Other Asset-Backed Securities [Member] |  |
Available-for-sale Securities, Fair Value | 1,149 | 1,085
Recurring | Other Asset-Backed Securities [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Other Asset-Backed Securities [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 1,149 | 1,085
Recurring | Other Asset-Backed Securities [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Redeemable Preferred Stock [Member] |  |
Available-for-sale Securities, Fair Value | 38 | 29
Recurring | Redeemable Preferred Stock [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Redeemable Preferred Stock [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 27 | 22
Recurring | Redeemable Preferred Stock [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | 11 | 7
Recurring | Debt Securities [Member] |  |
Available-for-sale Securities, Fair Value | 15,897 | 15,255
Recurring | Debt Securities [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 1,665 | 1,597
Recurring | Debt Securities [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 14,160 | 13,581
Recurring | Debt Securities [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | 72 | 77
Recurring | Equity Securities [Member] |  |
Available-for-sale Securities, Fair Value | 80 | 73
Recurring | Equity Securities [Member] | Level 1 |  |
Available-for-sale Securities, Fair Value | 9 | 19
Recurring | Equity Securities [Member] | Level 2 |  |
Available-for-sale Securities, Fair Value | 0 | 0
Recurring | Equity Securities [Member] | Level 3 |  |
Available-for-sale Securities, Fair Value | $ 71 | $ 54

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