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Income Taxes - Income from continuing operations before income tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income before income taxes: |  |  |
Income from continuing operations before income taxes | $ 1,689 | $ 1,765 | $ 1,538
Current: |  |  |
Total current | 490 | 468 | 404
Deferred tax expense (benefit): |  |  |
Total deferred | (223) | (134) | (14)
Total income taxes expenses | 267 | 334 | 390
U.K. [Member] |  |  |
Income before income taxes: |  |  |
Income from continuing operations before income taxes | 149 | 347 | 96
Current: |  |  |
Total current | 43 | 1 | (18)
Deferred tax expense (benefit): |  |  |
Total deferred | (39) | 38 | 43
U.S. [Member] |  |  |
Income before income taxes: |  |  |
Income from continuing operations before income taxes | (51) | (55) | 349
Current: |  |  |
Total current | 137 | 156 | 111
Deferred tax expense (benefit): |  |  |
Total deferred | (140) | (133) | (48)
U.S. state and local [Member] |  |  |
Current: |  |  |
Total current | 54 | 75 | 52
Deferred tax expense (benefit): |  |  |
Total deferred | (14) | (24) | 10
Other [Member] |  |  |
Income before income taxes: |  |  |
Income from continuing operations before income taxes | 1,591 | 1,473 | 1,093
Current: |  |  |
Total current | 256 | 236 | 259
Deferred tax expense (benefit): |  |  |
Total deferred | $ (30) | $ (15) | $ (19)

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