Securities Available for Sale and Securities Held to Maturity (Maturities of Securities Available for Sale) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Within 1 year	$ 5,773
Securities available for sale, After 1 year through 5 years	24,213
Securities available for sale, After 5 years through 10 years	14,141
Securities available for sale, After 10 years	21,519
Securities available for sale, Fair Value	65,646	$ 54,783
Securities available for sale, Within 1 year amortized cost	5,774
Securities available for sale, After 1 year through 5 years amortized cost	24,247
Securities available for sale, After 5 years through 10 years amortized cost	14,160
Securities available for sale, After 10 years amortized cost	21,679
Securities available for sale, Amortized Cost	65,860	54,520
U.S. agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, After 1 year through 5 years	1,883
Securities available for sale, After 5 years through 10 years	10,372
Securities available for sale, After 10 years	9,894
Securities available for sale, Fair Value	22,149	18,717
Securities available for sale, Amortized Cost	22,014	18,487
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, After 1 year through 5 years	7,014
Securities available for sale, After 5 years through 10 years	3,555
Securities available for sale, After 10 years	10,916
Securities available for sale, Fair Value	21,485	19,366
Securities available for sale, Amortized Cost	21,784	19,320
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Within 1 year	2,344
Securities available for sale, After 1 year through 5 years	8,403
Securities available for sale, Fair Value	10,747	8,045
Securities available for sale, Amortized Cost	10,764	8,023
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Within 1 year	2,494
Securities available for sale, After 1 year through 5 years	3,015
Securities available for sale, After 5 years through 10 years	195
Securities available for sale, Fair Value	5,704	2,994
Securities available for sale, Amortized Cost	5,719	2,993
U.S. agency notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, After 1 year through 5 years	3,150
Securities available for sale, Fair Value	3,150	3,795
Securities available for sale, Amortized Cost	3,177	3,839
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Within 1 year	935
Securities available for sale, After 1 year through 5 years	748
Securities available for sale, Fair Value	1,683	1,534
Securities available for sale, Amortized Cost	1,685	1,533
U.S. state and municipal securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, After 5 years through 10 years	19
Securities available for sale, After 10 years	405
Securities available for sale, Fair Value	424
Securities available for sale, Amortized Cost	414
Non-agency commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, After 10 years	299
Securities available for sale, Fair Value	299	317
Securities available for sale, Amortized Cost	298	310
Other securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, After 10 years	5
Securities available for sale, Fair Value	5	15
Securities available for sale, Amortized Cost	$ 5	$ 15

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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