Investments - Composition of US and Foreign Corporate Securities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Communications
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	$ 883	$ 950
Gross Unrealized Capital Gains	154	231
Gross Unrealized Capital Losses	2	1
Fair Value	1,035	1,180
Financial
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,713	2,921
Gross Unrealized Capital Gains	275	472
Gross Unrealized Capital Losses	13	2
Fair Value	2,975	3,391
Industrial and other companies
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	7,004	7,284
Gross Unrealized Capital Gains	713	1,155
Gross Unrealized Capital Losses	26	13
Fair Value	7,691	8,426
Energy
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	1,385	1,571
Gross Unrealized Capital Gains	216	259
Gross Unrealized Capital Losses	14	22
Fair Value	1,587	1,808
Utilities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,658	3,025
Gross Unrealized Capital Gains	310	530
Gross Unrealized Capital Losses	10	1
Fair Value	2,958	3,554
Transportation
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	854	929
Gross Unrealized Capital Gains	71	128
Gross Unrealized Capital Losses	1	20
Fair Value	924	1,037
Total
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	15,497	16,680
Gross Unrealized Capital Gains	1,739	2,775
Gross Unrealized Capital Losses	66	59
Fair Value	$ 17,170	$ 19,396

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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