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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | $ 990 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 5,511 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 2,991 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 3,510 |
Debt Securities, Available-for-sale, Amortized Cost | 15,335 |
Available-for-sale Securities With Established Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due To Mature Less Than One Year | 993 |
Due to mature one year through five years | 5,630 |
Due to mature after five years through ten years | 3,125 |
Due to mature greater than ten years | 3,768 |
Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 704 | $ 2,409
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 8 | 36
Available-for-sale Securities, Fair Value | 15,897 | 15,255
Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 0
Available-for-sale Securities, Fair Value | 595 | 577
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 577 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 595 |
Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Available-for-sale Securities, Fair Value | 637 | 605
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 608 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 637 |
Other Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 486 | 528
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7 | 15
Available-for-sale Securities, Fair Value | 1,149 | 1,085
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 1,148 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 1,149 |
Other Asset-Backed Securities [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 486 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7 |
Commercial Mortgage Backed Securities [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Residential Mortgage Backed Securities [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Maturing in Less than one Year [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 21 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Maturing in One Through Five Years [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 43 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 |
Maturing After Five Years Through Ten Years [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 88 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Maturing in Greater Than Ten Years [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 64 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Experience Rated Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Fair Value | 939 | $ 916
Supporting Experience Rated Products [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 11 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Experience Rated Products [Member] | Other Asset-Backed Securities [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Experience Rated Products [Member] | Commercial Mortgage Backed Securities [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Experience Rated Products [Member] | Residential Mortgage Backed Securities [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Experience Rated Products [Member] | Maturing in Less than one Year [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Experience Rated Products [Member] | Maturing in One Through Five Years [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Experience Rated Products [Member] | Maturing After Five Years Through Ten Years [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Experience Rated Products [Member] | Maturing in Greater Than Ten Years [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 4 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Remaining Products [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 693 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 8 |
Supporting Remaining Products [Member] | Other Asset-Backed Securities [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 486 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7 |
Supporting Remaining Products [Member] | Commercial Mortgage Backed Securities [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Remaining Products [Member] | Residential Mortgage Backed Securities [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Remaining Products [Member] | Maturing in Less than one Year [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 20 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Remaining Products [Member] | Maturing in One Through Five Years [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 43 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 |
Supporting Remaining Products [Member] | Maturing After Five Years Through Ten Years [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 82 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Supporting Remaining Products [Member] | Maturing in Greater Than Ten Years [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 60 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 |

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