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Investments - Unrealized Loss Position Maturities (Details) - Debt Securities [Member] - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 704 | $ 2,409
Supporting Experience Rated Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 11 |
Supporting Remaining Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 693 |
Maturing in Less than one Year [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 21 |
Maturing in Less than one Year [Member] | Supporting Experience Rated Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1 |
Maturing in Less than one Year [Member] | Supporting Remaining Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 20 |
Maturing in One Through Five Years [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 43 |
Maturing in One Through Five Years [Member] | Supporting Experience Rated Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Maturing in One Through Five Years [Member] | Supporting Remaining Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 43 |
Maturing After Five Years Through Ten Years [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 88 |
Maturing After Five Years Through Ten Years [Member] | Supporting Experience Rated Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6 |
Maturing After Five Years Through Ten Years [Member] | Supporting Remaining Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 82 |
Maturing in Greater Than Ten Years [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 64 |
Maturing in Greater Than Ten Years [Member] | Supporting Experience Rated Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 4 |
Maturing in Greater Than Ten Years [Member] | Supporting Remaining Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 60 |
Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Residential Mortgage Backed Securities [Member] | Supporting Experience Rated Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Residential Mortgage Backed Securities [Member] | Supporting Remaining Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2 |
Commercial Mortgage Backed Securities [Member] | Supporting Experience Rated Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Commercial Mortgage Backed Securities [Member] | Supporting Remaining Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2 |
Other Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 486 |
Other Asset-Backed Securities [Member] | Supporting Experience Rated Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |
Other Asset-Backed Securities [Member] | Supporting Remaining Products [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 486 |

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