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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2012 | Dec. 07, 2011 agreements | Jun. 29, 2011 | Dec. 31, 2012 2011 Repurchase Program [Member] | Dec. 31, 2011 2011 Repurchase Program [Member] | Dec. 31, 2010 2011 Repurchase Program [Member] | Jun. 29, 2011 2011 Repurchase Program [Member] | Dec. 31, 2012 2007 Repurchase Program [Member] | Dec. 31, 2011 2007 Repurchase Program [Member] | Dec. 31, 2010 2007 Repurchase Program [Member] | Dec. 31, 2012 First ASR Agreement [Member] | Dec. 31, 2012 Second ASR Agreement [Member] | Dec. 31, 2012 Uncollared ASR Agreement [Member] | Dec. 12, 2011 Uncollared ASR Agreement [Member] | Dec. 31, 2012 Capped ASR Agreement [Member] | Dec. 31, 2012 Subsequent Event [Member]
Dividend history |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend rate (in usd per share) |  | $ 0.255 |  | $ 0.250 |  | $ 0.235 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.28
Annualized dividend rate (in usd per share) |  | $ 1.02 |  | $ 1.0 |  | $ 0.94 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special dividend (in usd per share) |  | $ 2.50 |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid |  | $ 984 | [1] | $ 296 | [1] | $ 292 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  |  |  |  |  |  | 6,800,000 | [2] | 26,300,000 | [2] | 0 | [2] |  | 0 | 8,400,000 | 8,700,000 |  |  |  |  |  |
Average price paid per share (in usd per share) |  | $ 50.35 | [1] | $ 40.48 | [1] | $ 29.37 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash utilized |  | 295 |  | 1,500 |  | 256 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening redeemable noncontrolling interest | 810 | 810 |  | 0 |  |  |  | 792 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest | 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interest | (33) | (223) |  | (7) |  | (17) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption value adjustment | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending redeemable noncontrolling interest | 810 | 810 |  | 0 |  |  |  | 792 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock authorized (shares) | 2,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value of Preferred stock (in usd per share) | $ 1 | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend rate (in usd per share) |  | $ 0.255 |  | $ 0.250 |  | $ 0.235 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.28
Stock repurchase program number of shares authorized to be repurchased (shares) |  |  |  | 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
Maximum number of shares authorized for repurchase under stock repurchase plan as percentage of outstanding common stock |  |  |  |  |  |  |  |  |  | 17.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares available under repurchase program |  |  |  |  |  |  |  |  |  |  | 16,900,000 |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Accelerated Share Repurchase Program, Number of Agreements Entered |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of additional shares |  |  |  | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of shares at a per share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 | 250 |  | 250 | 250 |
Percentage of VWAP of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110.00% |  |  |  |
Shares received on initial delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  | 5,000,000 |
Percentage of shares received on initial delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Shares hold back on initial delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |
Accelerated Share Repurchases Additional Shares Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  | 100,000 |
Accelerated Share Repurchases Shares Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  | 5,000,000 |
Interest In Joint Venture Minimum Percentage |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Agreement Terms, Change of Control, Put Option for Minority Interest Ownership, Effective Period |  | 15 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Average price paid per share information does not include the accelerated share repurchase transaction as discussed in more detail below.
[2] | 2012 includes shares received at the conclusion of the uncollared Accelerated Share Repurchase Agreement described in more detail below.

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