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Capitalization (Details 1) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Schedule of Capitalization [Line Items]
Capital lease obligations	$ 73	$ 89
Unamortized debt premiums (discounts)	(39)	(41)
Unamortized debt issuance costs	(95)	(99)
Unamortized fair value adjustments	10	(1)
Currently payable long-term debt	(503)	(558)
Total long-term debt and other long-term obligations	17,751	18,687
FMBs and secured notes - fixed rate
Schedule of Capitalization [Line Items]
FMBs and secured notes - fixed rate	$ 4,355	4,692
FMBs and secured notes - fixed rate | Minimum
Schedule of Capitalization [Line Items]
Interest rate (percent)	1.726%
FMBs and secured notes - fixed rate | Maximum
Schedule of Capitalization [Line Items]
Interest rate (percent)	9.74%
Unsecured notes - fixed rate
Schedule of Capitalization [Line Items]
Unsecured debt	$ 13,450	13,155
Unsecured notes - fixed rate | Minimum
Schedule of Capitalization [Line Items]
Interest rate (percent)	2.85%
Unsecured notes - fixed rate | Maximum
Schedule of Capitalization [Line Items]
Interest rate (percent)	7.70%
Unsecured notes - variable rate
Schedule of Capitalization [Line Items]
Interest rate (percent)	3.27%
Unsecured debt	$ 500	$ 1,450

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