Income Taxes (Details - Deferred Taxes and Valuation Allowance) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Taxes and Valuation Allowance Text [Line Items]
Deferred tax asset related to net operating losses	$ 162	$ 349
Undistributed earnings of foreign subsidiaries	0
Valuation allowance	(20)	(23)	$ (35)	$ (82)
Valuation allowance, deferred tax asset, increase (decrease), amount	(3)	(12)
Income tax expense (benefit) due to change in tax status			(25)
Deferred tax assets:
Deferred tax asset related to net operating losses	162	349
Reserves and allowances, net	105	155
Financial instruments valuations	54	35
Deferred compensation	34	34
Tax credits	69	68
Other	1	18
Total deferred tax assets	425	659
Valuation allowance	(20)	(23)	$ (35)	$ (82)
Total deferred tax assets, net of valuation allowance	405	636
Deferred tax liabilities:
Depreciation and amortization	(413)	(385)
Other	(2)	0
Total deferred tax liabilities	(415)	(385)
Net deferred tax asset		$ 251
Net deferred tax liabilities	(10)
Federal Jurisdiction [Member]
Deferred Taxes and Valuation Allowance Text [Line Items]
Operating Loss Carryforwards	221
Deferred tax asset related to net operating losses	46
Valuation allowance	0
Deferred tax assets:
Deferred tax asset related to net operating losses	46
Valuation allowance	0
State and Local Jurisdiction
Deferred Taxes and Valuation Allowance Text [Line Items]
Operating Loss Carryforwards	2,300
Deferred tax asset related to net operating losses	114
Valuation allowance recorded against net operating losses	20
Deferred tax assets:
Deferred tax asset related to net operating losses	$ 114
Earliest Tax Year | State and Local Jurisdiction
Deferred Taxes and Valuation Allowance Text [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2019
Latest Tax Year | State and Local Jurisdiction
Deferred Taxes and Valuation Allowance Text [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2037