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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	730us-gaap_OtherShortTermInvestments	$ 760us-gaap_OtherShortTermInvestments	$ 899us-gaap_OtherShortTermInvestments
Goodwill	1,057us-gaap_Goodwill	1,057us-gaap_Goodwill	979us-gaap_Goodwill
Nonrecurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Impaired loans	15	5	1
Level 3 [Member] \| Recurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	73	102	141
Level 3 [Member] \| Nonrecurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Impaired loans	15	5	1
Goodwill	1,057	$ 1,057	$ 979
Level 3 [Member] \| EBITDA Multiple [Member] \| Recurring [Member] \| Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	5.40%	5.40%	5.40%
Level 3 [Member] \| EBITDA Multiple [Member] \| Recurring [Member] \| Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	6.00%	6.00%	6.00%
Level 3 [Member] \| EBITDA Multiple [Member] \| Recurring [Member] \| Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	5.50%	5.50%	5.90%
Level 3 [Member] \| EBITDA Multiple (Where Applicable) [Member] \| Recurring [Member] \| Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs		5.50%	4.90%
Level 3 [Member] \| EBITDA Multiple (Where Applicable) [Member] \| Recurring [Member] \| Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs		6.20%	10.00%
Level 3 [Member] \| EBITDA Multiple (Where Applicable) [Member] \| Recurring [Member] \| Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	5.80%	5.80%	5.90%
Level 3 [Member] \| Revenue Multiple (Where Applicable) [Member] \| Recurring [Member] \| Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs		4.30%	0.80%
Level 3 [Member] \| Revenue Multiple (Where Applicable) [Member] \| Recurring [Member] \| Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs		4.30%	4.50%
Level 3 [Member] \| Revenue Multiple (Where Applicable) [Member] \| Recurring [Member] \| Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	4.30%	4.30%	4.10%
Level 3 [Member] \| Discount [Member] \| Nonrecurring [Member] \| Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	0.00%	10.00%	0.00%
Level 3 [Member] \| Discount [Member] \| Nonrecurring [Member] \| Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	100.00%	64.00%	80.00%
Level 3 [Member] \| Discount [Member] \| Nonrecurring [Member] \| Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	36.00%	62.00%	25.00%
Level 3 [Member] \| Earnings Multiple of Peers [Member] \| Nonrecurring [Member] \| Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Significant unobservable input	11.40%	11.40%	10.10%
Level 3 [Member] \| Earnings Multiple of Peers [Member] \| Nonrecurring [Member] \| Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Significant unobservable input	15.90%	15.90%	14.40%
Level 3 [Member] \| Earnings Multiple of Peers [Member] \| Nonrecurring [Member] \| Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Significant unobservable input	12.92%	12.92%	11.59%
Level 3 [Member] \| Equity Multiple of Peers [Member] \| Nonrecurring [Member] \| Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Significant unobservable input	1.20%	1.20%	1.17%
Level 3 [Member] \| Equity Multiple of Peers [Member] \| Nonrecurring [Member] \| Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Significant unobservable input	1.22%	1.22%	1.29%
Level 3 [Member] \| Equity Multiple of Peers [Member] \| Nonrecurring [Member] \| Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Significant unobservable input	1.21%	1.21%	1.24%
Level 3 [Member] \| Control Premium [Member] \| Nonrecurring [Member] \| Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	10.00%	10.00%
Level 3 [Member] \| Control Premium [Member] \| Nonrecurring [Member] \| Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	30.00%	30.00%
Level 3 [Member] \| Control Premium [Member] \| Nonrecurring [Member] \| Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	19.70%	19.70%	35.00%
Level 3 [Member] \| Weighted-average Cost of Capital [Member] \| Nonrecurring [Member] \| Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	13.00%	13.00%
Level 3 [Member] \| Weighted-average Cost of Capital [Member] \| Nonrecurring [Member] \| Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	14.00%	14.00%
Level 3 [Member] \| Weighted-average Cost of Capital [Member] \| Nonrecurring [Member] \| Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Percentage of significant unobservable inputs	13.52%	13.52%	13.00%
Level 3 [Member] \| Impaired Loans [Member] \| Nonrecurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value measurement, valuation technique	Fair value of underlying collateral
Level 3 [Member] \| Goodwill [Member] \| Nonrecurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value measurement, valuation technique	Discounted cash flow and market data
Level 3 [Member] \| Other Investments [Member] \| Recurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value measurement, valuation technique	Individual analysis of the condition of each investment

Other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer.

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