Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, Tax	$ (672)
Balance, Net of Tax	(2,980)
Other comprehensive income (loss), before reclassifications, Tax	(538)
Other comprehensive income (loss), before reclassifications, net of Tax	1,057
Amounts reclassified from accumulated other comprehensive income (loss), Tax	0
Amounts reclassified from accumulated other comprehensive income (loss), net of Tax	(109)
Other comprehensive income (loss) before tax	1,486	1,553	(1,209)
Net current-period other comprehensive income (loss), Tax	(538)	(569)	0
Net current-period other comprehensive income (loss), net of Tax	948
Balance, Tax	(1,210)	(672)
Balance, Net of Tax	(2,032)	(2,980)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer	12 months
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	45
Tax benefit resulting from OCI allocation	538	569	0
Pension and Retiree Medical Liability
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	(2,322)
Other comprehensive income (loss), before reclassifications, before Tax	1,577
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	(142)
Other comprehensive income (loss) before tax	1,435
Balance, before Tax	(887)
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	(1)
Other comprehensive income (loss) before tax	(1)
Balance, before Tax	(2)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	15
Other comprehensive income (loss), before reclassifications, before Tax	18
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	34
Other comprehensive income (loss) before tax	52
Balance, before Tax	67
AA [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, Tax	(781)
Balance, Net of Tax	(3,088)
Other comprehensive income (loss), before reclassifications, Tax	(538)
Other comprehensive income (loss), before reclassifications, net of Tax	1,045
Amounts reclassified from accumulated other comprehensive income (loss), Tax	0
Amounts reclassified from accumulated other comprehensive income (loss), net of Tax	(109)
Other comprehensive income (loss) before tax	1,474	1,556	(1,210)
Net current-period other comprehensive income (loss), Tax	(538)	(569)	0
Net current-period other comprehensive income (loss), net of Tax	936
Balance, Tax	(1,319)	(781)
Balance, Net of Tax	(2,152)	(3,088)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer	12 months
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	45
Tax benefit resulting from OCI allocation	538	569	0
AA [Member] | Pension and Retiree Medical Liability
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	(2,322)
Other comprehensive income (loss), before reclassifications, before Tax	1,565
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	(142)
Other comprehensive income (loss) before tax	1,423
Balance, before Tax	(899)
AA [Member] | 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	(1)
Other comprehensive income (loss) before tax	(1)
Balance, before Tax	1
AA [Member] | Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) Net Of Tax [Roll Forward]
Balance, before Tax	13
Other comprehensive income (loss), before reclassifications, before Tax	18
Amounts reclassified from accumulated other comprehensive income (loss), before Tax	34
Other comprehensive income (loss) before tax	52
Balance, before Tax	$ 65