Total Equity and Other Comprehensive Income (Change in Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Total Equity And Other Comprehensive Income [Abstract]
Decrease in net unrealized losses for securities with OTTI charges, Pretax			$ (76)
Decrease in net unrealized losses for securities with OTTI charges, Tax (Expense) Benefit			15
Decrease in net unrealized losses for securities with OTTI charges, After-tax			(61)
Less: Net losses realized on sales of securities, Pretax			(34)
Less: Net losses realized on sales of securities, Tax (Expense) Benefit			12
Less: Net losses realized on sales of securities, After-tax			(22)
OTTI credit losses recognized in earnings	35	71	108	281
Less: Other OTTI losses realized in net income, Tax (Expense) Benefit			40
Less: Net OTTI losses realized in net income, After-tax			(68)
Change in net unrealized losses on OTTI securities, Pretax			66
Change in net unrealized losses on OTTI securities, Tax (Expense) Benefit			(37)
Change in net unrealized losses on OTTI securities, After-tax			29
Increase in net unrealized gains arising during the period for non-OTTI securities, Pretax			1,098
Increase in net unrealized gains arising during the period for non-OTTI securities, Tax (Expense) Benefit			(388)
Increase in net unrealized gains arising during the period for non-OTTI securities, After-tax			710
Less: Net gains realized on sales of securities, Pretax			221
Less: Net gains realized on sales of securities, Tax (Expense) Benefit			(80)
Less: Net gains realized on sales of securities, After-tax			141
Change in net unrealized gains on non-OTTI securities, Pretax			877
Change in net unrealized gains on non-OTTI securities, Tax (Expense) Benefit			(308)
Change in net unrealized gains on non-OTTI securities, After-tax			569
Change in net unrealized securities gains, Pretax			943
Change in net unrealized securities gains, Tax (Expense) Benefit			(345)
Change in net unrealized securities gains, After-tax			598
Increase in net unrealized gains during the period on cash flow hedge derivatives, Pretax			703
Increase in net unrealized gains during the period on cash flow hedge derivatives, Tax (Expense) Benefit			(258)
Increase in net unrealized gains during the period on cash flow hedge derivatives, After-tax			445
Less: Net gains realized in net income, Pretax			373
Less: Net gains realized in net income, Tax (Expense) Benefit			(137)
Net gains realized in net income, After-tax			236
Change in net unrealized gains on cash flow hedge derivatives, Pretax			330
Change in net unrealized gains on cash flow hedge derivatives, Tax (Expense) Benefit			(121)
Change in net unrealized gains on cash flow hedge derivatives, After-Tax			209
Change in pension, other postretirement and postemployment benefit plan adjustments, Pretax			14
Change in pension, other postretirement and postemployment benefit plan adjustments, Tax (Expense) Benefit			(4)
Change in pension, other postretirement and postemployment benefit plan adjustments, After-tax			10
Change in other, net Pretax			27
OtherComprehensiveIncomeOtherAdjustmentsTax			(16)
Change in other, net After-tax			11
Change in other comprehensive income (loss), Pretax			1,314
Other Comprehensive Income (Loss), Tax			(486)
Change in other comprehensive income (loss), After-tax			$ 828