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Investments - Available-for-Sale (Details) $ in Millions	Dec. 31, 2018 USD ($) Security	Dec. 31, 2017 USD ($) Security
Available-for-sale investments
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 509	$ 1,940
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 3	$ 5
Number of Positions, 12 Months or Less (in security) | Security	285	719
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 694	$ 227
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 8	$ 3
Number of Positions, 12 Months or More (in security) | Security	516	164
Corporate debt securities
Available-for-sale investments
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 509	$ 1,297
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 3	$ 3
Number of Positions, 12 Months or Less (in security) | Security	285	561
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 412	$ 94
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 5	$ 1
Number of Positions, 12 Months or More (in security) | Security	298	69
GSEs
Available-for-sale investments
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 0	$ 173
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 0	$ 1
Number of Positions, 12 Months or Less (in security) | Security	0	69
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 127	$ 95
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 1	$ 1
Number of Positions, 12 Months or More (in security) | Security	76	47
U.S. Treasury notes
Available-for-sale investments
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value		$ 470
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses		$ 1
Number of Positions, 12 Months or Less (in security) | Security		89
In a Continuous Loss Position for 12 Months or More, Estimated Fair value		$ 0
In a Continuous Loss Position for 12 Months or More, Unrealized Losses		$ 0
Number of Positions, 12 Months or More (in security) | Security		0
Municipal securities
Available-for-sale investments
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 0	$ 0
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 0	$ 0
Number of Positions, 12 Months or Less (in security) | Security	0	0
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 87	$ 38
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 1	$ 1
Number of Positions, 12 Months or More (in security) | Security	90	48
Asset-backed securities
Available-for-sale investments
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 0
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 0
Number of Positions, 12 Months or Less (in security) | Security	0
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 68
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 1
Number of Positions, 12 Months or More (in security) | Security	52

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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