Securities Available for Sale (Detail) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 24,627		$ 24,484
Unrealized Gains	2,923		2,534
Unrealized Losses	48		123
Fair Value	27,502		26,895
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	374		5,446
Unrealized Gains	12		115
Unrealized Losses	0		45
Fair Value	386		5,516
US Government Agencies Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,527		1,883
Unrealized Gains	118		19
Unrealized Losses	0		7
Fair Value	2,645		1,895
US States and Political Subdivisions Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	471		565
Unrealized Gains	21		17
Unrealized Losses	2		3
Fair Value	490		579
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,302		14,014
Unrealized Gains	728		372
Unrealized Losses	0		28
Fair Value	20,030		14,358
Mortgage-backed Securities, Issued by Private Enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	319		378
Unrealized Gains	1		3
Unrealized Losses	33		34
Fair Value	287		347
Collateralized Debt Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	337		50
Unrealized Gains	0		0
Unrealized Losses	5		0
Fair Value	332		50
Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	534		798
Unrealized Gains	13		15
Unrealized Losses	7		5
Fair Value	540		808
Corporate And Other Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53		464
Unrealized Gains	2		19
Unrealized Losses	1		1
Fair Value	54		482
Equity Securities, Coca Cola
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0		0
Unrealized Gains	2,027		1,973
Unrealized Losses	0		0
Fair Value	2,027		1,973
Equity Securities, Other
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	710	[1]	886	[1]
Unrealized Gains	1	[1]	1	[1]
Unrealized Losses	0	[1]	0	[1]
Fair Value	$ 711	[1]	$ 887	[1]

[1] At September 30, 2011, other equity securities included the following securities at cost: $171 million in FHLB of Atlanta stock, $391 million in Federal Reserve Bank stock, and $148 million in mutual fund investments. At December 31, 2010, other equity securities included the following securities at cost: $298 million in FHLB of Atlanta stock, $391 million in Federal Reserve Bank stock, and $197 million in mutual fund investments.