Income Taxes (Details - Deferred Taxes and Valuation Allowance) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Deferred tax asset related to net operating losses	$ 96	$ 162
Valuation allowance	(20)	(20)	$ (23)	$ (35)
Deferred tax assets:
Deferred tax asset related to net operating losses	96	162
Reserves and allowances, net	70	105
Leasing liability	58	0
Deferred compensation	20	34
Financial instruments valuations	1	54
Tax credits	2	69
Other	0	1
Total deferred tax assets	247	425
Valuation allowance	(20)	(20)	$ (23)	$ (35)
Total deferred tax assets, net of valuation allowance	227	405
Deferred tax liabilities:
Depreciation and amortization	(506)	(413)
Leasing asset	(52)	0
Other	(6)	(2)
Total deferred tax liabilities	(564)	(415)
Net deferred tax liabilities	(337)	$ (10)
Federal Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	14
Deferred tax asset related to net operating losses	3
Valuation allowance	0
Deferred tax assets:
Deferred tax asset related to net operating losses	3
Valuation allowance	0
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,900
Deferred tax asset related to net operating losses	93
Valuation allowance	(20)
Deferred tax assets:
Deferred tax asset related to net operating losses	93
Valuation allowance	$ (20)
State and Local Jurisdiction | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2026
State and Local Jurisdiction | Latest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2038