Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000000001 (http://www.sec.gov/CIK)

Available-for-sale Securities, Contractual Maturities [Line Items]	Period [Axis]
	2019-12-31
	Major Types of Available-for-Sale Debt and Equity Securities [Axis]
	Treasury bills [Member]	Corporate bonds [Member]	Sovereign debt securities [Member]	All Available-for-Sale Debt and Equity Securities [Domain]
Available-for-sale securities at amortized cost [Roll Up]
Due in one year or less, amortized cost	100,000,000	100,000,000	100,000,000	300,000,000
Due after one year through five years, amortized cost	100,000,000	100,000,000	100,000,000	300,000,000
Due after five years through ten years, amortized cost	100,000,000	100,000,000	100,000,000	300,000,000
Due after ten years, amortized cost	100,000,000	100,000,000	100,000,000	300,000,000
No contractual maturity dates, amortized cost	100,000,000	100,000,000	100,000,000	300,000,000
Available-for-sale securities at amortized cost	500,000,000	500,000,000	500,000,000	1,500,000,000
Available-for-sale securities at estimated fair value [Roll Up]
Due in one year or less, estimated fair value	100,000,000	100,000,000	100,000,000	300,000,000
Due after one year through five years, estimated fair value	100,000,000	100,000,000	100,000,000	300,000,000
Due after five years through ten years, estimated fair value	100,000,000	100,000,000	100,000,000	300,000,000
Due after ten years, estimated fair value	100,000,000	100,000,000	100,000,000	300,000,000
No contractual maturity dates, estimated fair value	100,000,000	100,000,000	100,000,000	300,000,000
Available-for-sale securities at estimated fair value	500,000,000	500,000,000	500,000,000	1,500,000,000