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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]      
Other investments $ 691 $ 760 $ 822
Goodwill 1,060 1,057 1,051
Nonrecurring [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Impaired loans 3 5 6
Level 3 [Member] | Recurring [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Other investments 66 102 115
Level 3 [Member] | Nonrecurring [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Impaired loans 3 5 6
Goodwill $ 1,060 $ 1,057 $ 1,051
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    
Level 3 [Member] | Discount [Member] | Recurring [Member] | Weighted Average [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Percentage of significant unobservable inputs 6.00%    
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% 10.00%
Level 3 [Member] | Discount [Member] | Nonrecurring [Member] | Maximum [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Percentage of significant unobservable inputs 50.00% 64.00% 90.00%
Level 3 [Member] | Discount [Member] | Nonrecurring [Member] | Weighted Average [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Percentage of significant unobservable inputs 14.00% 62.00% 24.00%
Level 3 [Member] | Equity Instruments of Public Companies [Member] | Recurring [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value measurement, valuation technique Market approach    
Level 3 [Member] | EBITDA Multiple [Member] | Recurring [Member] | Minimum [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Percentage of significant unobservable inputs   5.40% 6.00%
Level 3 [Member] | EBITDA Multiple [Member] | Recurring [Member] | Maximum [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Percentage of significant unobservable inputs   6.00% 6.40%
Level 3 [Member] | EBITDA Multiple [Member] | Recurring [Member] | Weighted Average [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Percentage of significant unobservable inputs 5.40% 5.50% 6.30%
Level 3 [Member] | EBITDA Multiple (Where Applicable) [Member] | Recurring [Member] | Minimum [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Percentage of significant unobservable inputs 5.40% 5.50% 5.50%
Level 3 [Member] | EBITDA Multiple (Where Applicable) [Member] | Recurring [Member] | Maximum [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Percentage of significant unobservable inputs 6.50% 6.20% 6.00%
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 6.40% 5.80% 5.70%
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] | Revenue Multiple (Where Applicable) [Member] | Recurring [Member] | Minimum [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Percentage of significant unobservable inputs   4.30% 4.30%
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% 4.30%
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%