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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
2007 Stock Incentive Plan (Shares)      
Beginning Balance 7,917,719 8,937,985 10,376,800
Shares Granted 923,407 [1] 1,451,136 [2] 1,211,533
Shares Cancelled (115,711) (69,340) (163,221)
Shares Distributed (2,274,777) (2,402,062) (2,487,127)
Ending Balance 6,450,638 7,917,719 8,937,985
Intrinsic Value Of SIP Shares Which Vested And Were Distributed [Member]      
Distributed [3] $ 81 $ 88 $ 86
2007 ROI Unit Stock Plan (Shares) [Member]      
Beginning Balance 4,994 6,370 9,614
Shares Distributed (1,145) (1,376) (3,244)
Ending Balance 3,849 4,994 6,370
[1] Granted under the Company's amended 2007 Stock Incentive Plan, pending stockholder approval at the Company's 2018 Annual Meeting.
[2] Stock Incentive Plan number of granted restricted stock units related to 2016 was adjusted by 5,657 additional restricted stock units during the year ended December 31, 2017.
[3] Intrinsic value of SIP units distributed represents the compensation value reported to the participants.