Long-Term Debt (Scheduled Remaining Maturity Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
2014	$ 4,554
2015	17,694
2016	12,274
2017	13,996
2018	4,963
2019 and thereafter	13,404
Derivative, Amount of Hedged Item	414	445
Long-term debt	67,299	69,465
Unsecured Debt [Member]
Debt Instrument [Line Items]
2014	1,706
2015	4,862
2016	1,866
2017	4,297
2018	1,185
2019 and thereafter	9,721
Derivative, Amount of Hedged Item	414	445
Long-term debt	24,051	27,191
Unsecured Debt [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
2014	1,746
2015	4,920
2016	1,934
2017	4,377
2018	1,278
2019 and thereafter	10,837
Derivative, Amount of Hedged Item	414
Long-term debt	25,506
Unsecured Debt [Member] | Original Issue Discount [Member]
Debt Instrument [Line Items]
2014	(40)
2015	(58)
2016	(68)
2017	(80)
2018	(93)
2019 and thereafter	(1,116)
Derivative, Amount of Hedged Item	0
Long-term debt	(1,455)
Secured Debt [Member]
Debt Instrument [Line Items]
Derivative, Amount of Hedged Item	0	0
Long-term debt	43,248	42,274
Secured Debt [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
2014	2,848
2015	12,832
2016	10,408
2017	9,699
2018	3,778
2019 and thereafter	3,683
Derivative, Amount of Hedged Item	0
Long-term debt	$ 43,248