Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) (Tables)

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Share Repurchases

The table below summarizes the company’s share repurchases to date under the authorizations described above:

							Shares Repurchased (in millions)
Repurchase Program Authorization Date	Amount Authorized (in millions)		Total Shares Retired (in millions)	Average  Price Per Share(1)		Date Completed	Six Months Ended June 30
							2021	2020
September 16, 2015	$	4,000	15.4	$	260.33	March 2020	—	0.9
December 4, 2018	$	3,000	7.0	329.81			6.5	0.5
January 25, 2021	$	3,000	—	—			—	—

(1)Includes commissions paid.