Investments in Debt and Equity Securities (Details 3) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Investments in Debt and Equity Securities
Due in one year or less, Cost Basis	$ 154		$ 154
Due in one year or less, Fair Value	156		156
Due after one year through five years, Cost Basis	730		730
Due after one year through five years, Fair Value	753		753
Due after five through ten years, Cost Basis	271		271
Due after five years through ten years, Fair Value	278		278
Due after ten years, Cost Basis	62		62
Due after ten years, Fair Value	63		63
Debt Securities, Available-for-sale, Amortized Cost	1,658		1,658		$ 1,613
Available-for-sale securities, debt securities	1,703		1,703		1,683
Available-for-sale Securities, Proceeds, Gains and Losses
Proceeds from the sale of available-for-sale securities	97	$ 74	322	$ 197
Gross gains from the sale of available-for-sale securities	1	0	3	1
Gross losses from the sale of available-for-sale securities	0	0	0	1
Schedule of Held-to-maturity Securities
Time deposit					0
Debt Securities, Held-to-maturity, Unrealized Loss	0		0		0
Debt Securities, Held-to-maturity, Unrealized Gain	0		0		0
Unrealized gain (loss) on equity securities	46	$ 9	65	$ (1)
Bank Time Deposits
Schedule of Held-to-maturity Securities
Time deposit	543		543		0
U.S. governmental agency mortgage-backed securities
Schedule of Investments in Debt and Equity Securities
Debt Securities, Available-for-sale, Amortized Cost	340		340		362
Available-for-sale securities, debt securities	349		349		374
Residential
Schedule of Investments in Debt and Equity Securities
Debt Securities, Available-for-sale, Amortized Cost	4		4		5
Available-for-sale securities, debt securities	4		4		5
Commercial
Schedule of Investments in Debt and Equity Securities
Debt Securities, Available-for-sale, Amortized Cost	97		97		60
Available-for-sale securities, debt securities	$ 100		$ 100		$ 64