Investments - Composition of US and Foreign Corporate Securities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Communications
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	$ 981	$ 1,002
Gross Unrealized Capital Gains	214	156
Gross Unrealized Capital Losses	1	0
Fair Value	1,194	1,158
Financial
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,751	2,650
Gross Unrealized Capital Gains	412	302
Gross Unrealized Capital Losses	9	0
Fair Value	3,154	2,952
Industrial and other companies
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	7,088	7,053
Gross Unrealized Capital Gains	1,024	667
Gross Unrealized Capital Losses	26	11
Fair Value	8,086	7,709
Energy
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	1,600	1,675
Gross Unrealized Capital Gains	193	185
Gross Unrealized Capital Losses	38	18
Fair Value	1,755	1,842
Utilities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	3,005	2,913
Gross Unrealized Capital Gains	494	294
Gross Unrealized Capital Losses	1	1
Fair Value	3,498	3,206
Transportation
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	923	856
Gross Unrealized Capital Gains	101	78
Gross Unrealized Capital Losses	25	2
Fair Value	999	932
Total
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	16,348	16,149
Gross Unrealized Capital Gains	2,438	1,682
Gross Unrealized Capital Losses	100	32
Fair Value	$ 18,686	$ 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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