Investments - Composition of US and Foreign Corporate Securities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Communications
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	$ 976	$ 1,002
Gross Unrealized Capital Gains	117	156
Gross Unrealized Capital Losses	4	0
Fair Value	1,089	1,158
Financial
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,614	2,650
Gross Unrealized Capital Gains	205	302
Gross Unrealized Capital Losses	33	0
Fair Value	2,786	2,952
Industrial and other companies
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	7,014	7,053
Gross Unrealized Capital Gains	459	667
Gross Unrealized Capital Losses	178	11
Fair Value	7,295	7,709
Energy
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	1,616	1,675
Gross Unrealized Capital Gains	38	185
Gross Unrealized Capital Losses	189	18
Fair Value	1,465	1,842
Utilities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,938	2,913
Gross Unrealized Capital Gains	171	294
Gross Unrealized Capital Losses	55	1
Fair Value	3,054	3,206
Transportation
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	856	856
Gross Unrealized Capital Gains	39	78
Gross Unrealized Capital Losses	37	2
Fair Value	858	932
Total
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	16,014	16,149
Gross Unrealized Capital Gains	1,029	1,682
Gross Unrealized Capital Losses	496	32
Fair Value	$ 16,547	$ 17,799

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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