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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
2007 Stock Incentive Plan (Shares) |  |  |  |  |
Beginning Balance |  | 5,472,706 | 6,473,720 |  | 7,917,719
Shares Granted |  | 1,374,560 | 1,146,267 | [1] | 946,489
Shares Cancelled |  | 91,443 | (63,657) |  | 115,711
Shares Distributed |  | 1,627,565 | (2,083,624) |  | 2,274,777
Ending Balance |  | 5,128,258 | 5,472,706 |  | 6,473,720
Intrinsic Value Of SIP Shares Which Vested And Were Distributed [Member] |  |  |  |  |
Distributed | [2] | $ 91 | $ 164 |  | $ 81
2007 ROI Unit Stock Plan (Shares) [Member] |  |  |  |  |
Beginning Balance |  |  | 3,849 |  | 4,994
Shares Distributed |  |  | (3,849) |  | 1,145
Ending Balance |  |  |  |  | 3,849
[1] | Stock Incentive Plan number of granted restricted stock units related to 2018 was adjusted by 640 additional restricted stock units during the year ended December 31, 2019.
[2] | Intrinsic value of SIP units distributed represents the compensation value reported to the participants.

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- Definition Shares granted, net of shares distributed and forfeited. + References No definition available. + Details
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- Definition Total shares distributed during the period. + References No definition available. + Details
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- Details
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- Details
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- Details
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