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Shareholders' Equity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
item
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Jun. 18, 2014
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Mar. 19, 2014
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Jun. 19, 2013
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May 31, 2014
item
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May 31, 2013
item
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Jun. 30, 2014
item
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Jun. 30, 2013
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Jun. 30, 2014
item
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Jun. 30, 2013
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Dec. 31, 2013
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| Distribution of qualifying additional paid-in capital | |||||||||||
| Cash distribution approved in the form of additional paid-in capital (in dollars per share) | $ 3.00 | $ 2.24 | |||||||||
| Number of quarterly installments (in installments) | 4 | 4 | |||||||||
| Amount of installment (in dollars per share) | $ 0.75 | $ 0.56 | |||||||||
| Liability for distribution payable | $ 816 | $ 1,100 | $ 808 | ||||||||
| Installment of dividend paid | $ 272 | $ 202 | $ 202 | $ 272 | $ 202 | $ 474 | $ 202 | ||||
| Shares held by subsidiary | |||||||||||
| Number of subsidiaries to whom shares were issued | 1 | 1 | 1 | ||||||||
| Number of shares held by subsidiary | 8.8 | 8.8 | 8.8 | 10.2 | |||||||