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Fair Value Measurements (Details 3) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt securities
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	$ 783	$ 774
Unrealized Gain	5	11
Unrealized Losses	(22)	(17)
Fair Value	766	768
Equity securities
Amortized cost basis, unrealized gains and losses and fair values of investments in available-for-sale securities
Cost Basis	263	254
Unrealized Gains	24	40
Unrealized Losses	(2)	0
Fair Value	$ 285	$ 294

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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