Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, Tax	$ (1,210)
Balance, Net of Tax	(2,032)
Other comprehensive income (loss), before reclassifications, Tax	0
Other comprehensive income (loss), before reclassifications, net of Tax	(67)
Amounts reclassified from accumulated other comprehensive income (loss), Tax	0
Amounts reclassified from accumulated other comprehensive income (loss), net of Tax	(36)
Other comprehensive loss before tax	(103)	(50)
Net current-period other comprehensive income (loss), Tax	0	0
Net current-period other comprehensive income (loss), net of Tax	(103)
Balance, Tax	(1,210)
Balance, Net of Tax	(2,135)
Pension and retiree medical liability
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	(887)
Other comprehensive income (loss), before reclassifications, before Tax	0
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	(45)
Other comprehensive loss before tax	(45)
Balance, before Tax	(932)
Unrealized gain/(loss) on investments
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	(2)
Other comprehensive income (loss), before reclassifications, before Tax	0
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	2
Other comprehensive loss before tax	2
Balance, before Tax	0
Derivative financial instruments
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	67
Other comprehensive income (loss), before reclassifications, before Tax	(67)
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	7
Other comprehensive loss before tax	(60)
Balance, before Tax	7
AA [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, Tax	(1,319)
Balance, Net of Tax	(2,152)
Other comprehensive income (loss), before reclassifications, Tax	0
Other comprehensive income (loss), before reclassifications, net of Tax	(67)
Amounts reclassified from accumulated other comprehensive income (loss), Tax	0
Amounts reclassified from accumulated other comprehensive income (loss), net of Tax	(35)
Other comprehensive loss before tax	(102)	(50)
Net current-period other comprehensive income (loss), Tax	0	0
Net current-period other comprehensive income (loss), net of Tax	(102)
Balance, Tax	(1,319)
Balance, Net of Tax	(2,254)
AA [Member] | Pension and retiree medical liability
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	(899)
Other comprehensive income (loss), before reclassifications, before Tax	0
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	(44)
Other comprehensive loss before tax	(44)
Balance, before Tax	(943)
AA [Member] | Unrealized gain/(loss) on investments
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	1
Other comprehensive income (loss), before reclassifications, before Tax	0
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	2
Other comprehensive loss before tax	2
Balance, before Tax	3
AA [Member] | Derivative financial instruments
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	65
Other comprehensive income (loss), before reclassifications, before Tax	(67)
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	7
Other comprehensive loss before tax	(60)
Balance, before Tax	$ 5